Oval-shaped inner cage not for everyone.
936799
I have a Giro Aeon and two Giro Air Attacks w/visor (after the first saved my noggin during a ride), so I am a big fan of their products and was very excited to get this too as it has been proclaimed to combine the aerodynamics of the Air Attack and the lightweight/cooling of the Aeon.  Tried this out at my LBS and couldn't find a size that fits me well.  Medium is typically the right size Giro for me but the Synthe's inner cage is somewhat oval-shaped for whatever reason.  The medium (even when I let out the Roc Loc all the way) felt very tight on the side of my head; the large size, I could not get a good fit, and looked ridiculously large on my head.  Walked away very disappointed. So unless your head is slightly oval shaped (elongated front to back), beware when you order the Synthe.
4630381
It's a good cage. It's a bit stiff to open up, but that way I don't have to worry about it popping open.  I really like the pivoting hook; it has detents that keep it from spinning freely, but you can turn the light as needed. The picture shows a shiny metal reflector, but it's yellow. I suppose the other would make for a brighter light, but the yellow is plenty bright enough for my needs.
2175752
I dislike this cage and return it back due to difficulty to assemble it.. second the metal used on this cage is very substandard..I won't recommend this cage.. sorry
1876476
This is a very unique Terrarium.  I will be using it for a Gecko.  It was larger than I expected, but ended up being just fine.  I had to make a interior higher base for it, or I would have had to add a lot of substrate.  Doing that cut down the overall weight and materials. I used Zoo Med Excavator as the substrate and it worked great (about 15 lbs).
This can be a little difficult to assemble if you are not familiar with putting things together.  I used the Zoo Med Mini Combo Deep Dome Lamp Fixture, and It fit perfectly.  The whole thing is made of plastic, except for the aluminum mesh (barrier between light and terrarium).  The viewing glass is thin acrylic, and easily replaceable if it gets too scratched up.  It has 2 doors to add water, food, etc.  Just watch for the hinge pins on them, because they are very small and come out easily.  They fell out a couple of times during assembly and took me some time to find again.  I corrected this by just taping the opening where the hinge pins meet the doors.  It measures roughly at 25" wide, 16" deep, and 26" high.
4397982
For the most part good cage.  Bought a 32inch.  Smaller kennels tend to be made different than larger just remember that.  I needed to zip tip in middle of front and back pannel to top because it did not have center support latch to keep pannels together and my dog is an excape artist.  Also the metal is not an extremely strong metal so slightly bows in center of top but so do most cages.  Only thing that stinks is you have to latch each latch individually and being pregnant its hard to bend over to get bottom latch.  So I created a mechanism to open and close both latches with just a pull.
893996
While they fit in the tubes nice and tight, the inner lip that's supposed to let you pull it out is too small and smooth, so you can't really get these out once they're in, without a lot of wrangling.  Had to return them, as my customers will complain about that.
If that's not something you worry about, then these are good. They are sturdy and secure.
150918
It's a nice cage, nothing wrong with it. I am only giving it 3 stars because it was hard to put together and the instructions suck.
3549762
I bought this for a dwarf hamster. The construction of the enclosure is well made. The metal bars are sturdy and not prone to bending like with other cages I've seen. I suggest lubricating the wheel axle with come vegetable oil. Coconut oil in a spray can will work great since it's mostly saturated fat and won't go rancid.
2252676
A nice cage for the price.  Good for mid-size parrots.  Large birds will bend the bars and not have enough room.  Some small birds might have the bars too far away.  Instructions are bad, but it is not hard to figure it out.
2529685
This is a very good cage and my Indian Ringneck loves the room. Once we received all the correct parts for the cage it was easy to put together. They only suggestion I would have is that the company should really invest in better instructions.
775911
My chinchilla has been using this cage for a few years now and he seems to really like it. While it is not difficult to break down the cage and take the levels and ramps out for cleaning, it does take a bit more work than a single level cage. But, my chinchilla is used to a tri-level cage and I like giving him the extra room to move around. To me, it is worth adding on a little more cleaning time, so that my chinchilla has a more comfortable environment. My only complaint is that it is plastic and not as well-made as metal cages.
2115272
I have had no problems with this cage, and I have owned it over a year!  I enjoy the double openings!
3762606
Great cage, but be prepared with zip ties.  Assembly is easy to figure out, but difficult to put into practice.  Maybe wear gloves,  the wire cage has to be muscled into shape and so do the ledges so my fingers hurt after awhile.  (It took about 40 minutes and I'm a 40+ petite female).  Even after it was all said and done we needed zip ties for the corners just to be safe.  Our hamster was a baby and we were worried because she was small.  It is easy to clean which is a bonus.  So is the fact that it's sturdy and chew proof.  One other characteristic is that it is noisy.  When she runs on her wheel its very loud because of the wires.  Our previous cages were plastic and wire,  this is all metal so the wheel squeaks when she's on it.  It's not in a bedroom so it's not a problem for us, but something to be aware of if you plan on putting it in one.
1404680
The cage is quality built, but the screws at the end to connect all four sides were not tapped correctly resulting in an off shapened rectangle, with the vertical parts, and the extender tubes bowing inwards.  I moved the screws in one hole and it is better, but less room to hold the monitor.  :-(  I will try it for a week to see if that becomes problematic.  If so, back not goes.
3913154
We purchased the Habitrail OVO Pad for our daughter when she got a hamster.  She is taking wonderful care of the hamster; however this cage, though pretty to look at, has many design flaws in my opinion.

Our immediate first reaction to opening the box was how small the cage is.  Since I'm not a hamster I can't comment on how spacious or cramped a hamster might find the cage, but it's worthy of note because I feel the size of the cage combined with the minimal ventilation definitely requires the cage to be thoroughly cleaned more frequently that a wire cage or aquarium with a wire mesh top.

Though the design is attractive, only parts of the top are clear plastic; the rest is opaque.  Combined with the curvature, it is not that easy to view what's going on inside the cage, another consideration if you will have kids that want to watch the hamster closely.

The most troubling design flaws are the clasps for the front and back that open.  It is designed in such a way that there is little to no visual confirmation that the cage is latched properly.  Everything is plastic and flexible enough that depending on how you apply pressure when closing it, you may get a tactile "snap" when it latches, or you may not.

My daughter has twice thought she secured the latch but didn't, and because the opening is at hamster level, both times we discovered "Maya" running around on the floor.  As a side note, we have two cats and unbelievably they just followed Maya around and didn't consider her prey.  Thank god.

The cage comes with one connecting piece with an integrated water bottle.  The water bottle seems of low quality and tends to `pour' or drip heavily when turned upside down for quite some time before stopping.  At first I liked the idea of the water being away from the living area of the cage, but due to the design, dripped water pools up at the bottom of the connecting piece, which I felt was unsanitary. Maybe that's no more unsanitary than dripped water absorbing into the chips, but requiring the hamster to crawl through standing water to get clean water seems wrong.  I was afraid she would take to drinking THAT water.

To mitigate this concern, I drilled three very small holes at the bottom of the connecting piece and put a plastic dish below, so dripped water would run out of the cage.  This actually worked very well and I will give them credit for providing the basis of a nice design there.  They should integrate drainage under the water bottle into the base design.

Another problem was that during construction of the cage, the wheel would not stay together.  We had to hot-glue the "lug" that holds the wheel in the axle, to hold it securely.  This was after Maya ran herself right off the axle like a cartoon.

In summary, this cage looks attractive and if purchased with many options, could provide a very cool habitat for your mice or hamsters, but I think there is too much "form" and not enough "function".  We found it a poorly designed cage for children to use, and have since switched to an aquarium with a wire mesh top.  It is easier to clean, easier to watch the hamster, and more secure. Fortunately no hamsters were harmed in the process of reviewing this cage.
4423206
I have used this cage for a few months for my chams before writing my review, it's a good cage, but I have bought one of the off brands from sandfire and those are constructed better, I was a little disappointed. The box arrived in excellent condition but when assembled, there was some frame warping and too large of gap between the door hinge and side....cricket escapee's galore.... (I did put it together correctly and did not tighten down the screws until it bent the frame, matching all the sides up by letter.) If I need to purchase another I will spend the little extra to buy the Sandfire version. But the cage is okay other than that.
820129
I have used this cage and I currently have two baby rats living in it. It is a decent cage with a lot of potential. The levels have to removed with care however. An adult rodent should not call it home.