These are fun kits to build but keep in mind the molds ...
598866
These are fun kits to build but keep in mind the molds are not the best so some sanding & filler may be needed at the seams. The have between 25-30 parts and edge trimming is required.
3319440
Pros: Lots of great connector parts for corners, etc.
Cons: Runs of straight mold are a bit short.
3443235
I bought these plans for my four-year-old son to play with. I know that's not their intended purpose and I am making daily repairs with superglue lol. Over all for their actual purpose of being a model they're pretty nice. Only reason for 4 stars instead of 5 is landing gear is a pain in the ass to install. The other reason for 4 stars was on the Mitchell half of the casting on the body was melted back around the front glass and did not match up right. It almost looks like it's melted plastic but I know this is just a bad mold. Had it ben a modle id probly return it for anouther but for my 4 year old to play with its fine.
498487
Fun figures - I purchased the mold to make resin castings (though I'm sure it works with fondant and chocolate as well and it is a food grade mold) -- it works great!  I used quick dry resin in the mold and it releases and gives a good casting without the need for any mold release agent.  The reason for 4 stars instead of 5 - a little disappointed in the actually design.  From the picture I thought the molds would be more "scary" type of zombie but they have an almost child-like feel, not a "realistic" zombie (LOL yes I see the irony in that statement) but the cat is rounded and cartoonish and the zombies have more of a child-cartoon-Frankenstein feel than a scary bloody zombie.  I do love the coffin and wall pieces.  the coffin is a partial wedge so it can look like a raised top coming out of the ground.  The view on the cake picture is exactly all there is to the coffin.  The tiny skulls are cut off right under the nasal cavity, would be nice to have had a full skull but WYSIWYG.  Overall a fun mold and yes ... for those of us who love our resin embellies, this works great.
2039785
Pretty good kit overall. With 22 experiments from easy to hard, I would suggest making it a "together" project unless your child is 13+ or particularly good at assembling things. Within the instruction manual is not just a how-to for building each model but also some background that will give a frame of reference as to the usage in the real world. That, I think, is what sets this set apart from other typical building kits such as Lego, Knex, etc.

What kept me at 4 stars instead of 5 was the fact that it is difficult to differentiate some of the pieces based on the pictures in the manual. Having each step include multiple steps did not make that any easier.  It would also be nice if they had included extras of the very small pieces. As it is, if you drop one and it disappears you are then precluded from being able to build any of the projects that piece is in.
1524520
The mold is easy to use, my only criticism is that the plane can be a challenge to extract in one piece.
4142410
They could be a little easier to fill, to get the true shape you need to fill up all the way and there is always some water on top of the mold and breaking it open can be a bit tricky.  But its worth it if you like large spherical ice.
4288996
My daughter enjoyed putting this together. However, be prepared to help. After build a set and playing with it for a while, the pieces end up in a large lego bin where they are transformed into anything the kids can dream up. I added a photo of a structure we built with pieces from the Dream Cruiser.

The sets are really fun and good practice for following directions, but when the fun is over just let them build.
2902216
If you enjoy these far out Custom Theme model kits a Two Thumbs Up kick back and build or Customize
2847194
This was quite a bit of fun to play with.  Making colors to match the color cards was okay but making entire new colors was the most fun.  The crank was difficult for the children to turn, so my husband had to step in to help.  It was great that the kit included paper on which to make our art projects afterwards so everyone could take home a reminder of the paint that they made.

The kit is good for an afternoon of fun but there were distinct issues:  1) the crank was very difficult to turn and made a lot of noise (this was the crank to the mixing mechanism;  2) there wasn't much paint and it ran out very quickly.  A battery operated mixer could have solved the first issues and more paint, the second issue.  There are refill packs available but the kit is fairly pricey for an afternoon of craft.  If you are planning on using this for a group, you may want to pick up the extra paint to begin with.
1159105
I had a fun time putting this together. However, I will say that some of the pieces aren't backed up enough on their own and will fall off.. I don't ever plan on taking this apart so I used some super glue to help. My kit also had a handful of small critical pieces missing, which I had to request a replacement through the Lego website. It is a free replacement for them to mail the missing pieces, however my time explorations are on hault until I get them so I can complete my time machine. I wish the instructions were a little more clear in some areas. I found out that while building a portion of the back half of the car, that a few pieces didn't line up as they stated it would in the photo instructions. Not a big issue, i'm just going to have super glue be my trusted sidekick.

I would say if you are wanting to actually PLAY with this, to use superglue.. or be expecting of pieces to fall off since they aren't held on that well.
3145021
I got this for my 8 year old Godson after buying him some of the snapcircuit sets like Sophie.. Seemed like a nice transition into a new science and the set went over very well. He loved playing with the magnets and doing the projects (although they are limited).

For the price it's a good kit and although you will burn through the projects in a day there is enough here to keep the imagination going for quite a while.

The magnets seem to be about average in quality but the set itself is pretty cheaply made. If you can get this kit on sale I'd do so.  If not maybe look for some quality magnets and a nice book with hundreds of activities to do. Might be a better deal.
458653
The molds themselves are okay and the quality is decent; but they don't exacly fit/go together very well. The best mold is the block and I think it would have been better if they had different sizes of blocks so children could build something. The molding sand that goes with it is horrible/useless and I threw it away. Make sure you already have or buy kinetic sand before playing with this.
3246382
This is the third model I've done, and the most challenging.  The kit has 2 sheets of metal, and involves a lot of curves and bends, which are tricky but fun.  You really need a pair of jewelry pliers to do these models - and I've found the round nose type works best.  I definitely recommend these kits, and this one was my favorite to assemble - you just need a steady hand, patience and a keen eye, because the finished model is only about 2 inches high, including the statue on top!
2894860
Not worth the money, but still fun to build.
2745081
My son loves these melt 'n mold sets. Yes at times after pouring, over and over, we have gotten wax on the metal burner plate and I have had to scrape it off. And as to be expected not all of the wax pours out into the mold and some is left on the tray and therefore mixes with each round unless I scrape it between. There is no magic measurement when it comes to pieces of broken crayon. Thankfully my four year old doesn't care if the previous yellows and oranges mix with his blues and greens. My son has a ton of fun and as a parent expect a little clean up.
I do really enjoy that the lid locks down when it is heating up through cooling down so my son can't open it and burn himself. He gets a little impatient with not being able to do crayons back to back due to the locking for the heat up and cool down stage. This is for his safety.
3738680
Not all of the models in the included book will work as instructed. Either we did not get the correct pieces in the kit (the booklet shows curved pieces and my set had no curved pieces) or the booklet does not match the set.

However, it is a fun time consuming building toy that does well to drive off boredom for a bedbound patient. Just build your own models instead of the ones in the book.