For the price, it's a great backup pump.
351886
It is well built, but really is a backup pump. As to some posts about 300 pumps... Not sure. I had difficulty seating it, but once seated, it did take nearly 80 pumps to get full up pressure. A gauge would just be wrong on this thing. It's small, inexpensive. I bought two. My old longstroke Blackburn is a joy to use, but won't fit on my bike.
3971934
Bought this pump to finish emptying my pool after the circulation pump could not lift the water when it got below a certain level.  Must say I had some reservations about this pump being strong enough to do the job, but it proved to be quite capable for my needs. Pumped around 7000 gallons of water from the 8' deep pool in just a few hours.
4692132
For the price, it is a good spare and the rim is galvanized (so it won't rust).  If you are looking for a cheap backup tire, this one will do just fine.  I always hope I do not have to use the spare, and if I do, this one will work until I can get the original one back up and running.
2394498
I bought this pump after my original portable bike pump was unable to fill my tires to the required 80 psi they called for.  This pump definitely makes hitting the 60-80 psi range possible and the hose and built in little flip out base make it very easy to hold the pump steady with one foot while pumping it.

The only down sides are the gauge is somewhat inaccurate and can be hard to read and the clamp can be a little finicky when used with schrader valves.
2384441
Seems cheaply made, but works better than the old pumps.
3005083
When I received the pump, it looked smaller than I expected so I wasn't too sure how well it would work, but it seems to stand up to the ratings listed in the description. For such a small pump, it puts out a good amount of pressure (although I have no way to measure it exactly to see if the 35 PSI rating is true or not) and pushes plenty of water through with a 1.2 GPM rating. Keep these in mind when you're trying to decide if it will work for your application or not. It obviously isn't meant for moving a huge amount of water through a big fat pipe, but for smaller applications, it works great. The self-priming feature combined with the pressure switch is wonderful so that you don't have to manually turn it on, and I had no problems with it not working correctly. As soon as the line is opened, the pump comes on and starts pushing water through, and then shuts itself off when the line is closed.

I received this item for free or at a discount in exchange for an honest review. This is my true opinion of the product and has not been influenced by this fact.
647957
I bought this pump to replace my original pump on my Coleman Pop Up trailer. Install was easy, just 4 bolts. Would have been nice if the holes lined up with the old pumps holes, but they were no where close. Simple 2 wire connection. I installed a pre-filter as well. I highly recommend this. They are less than $10 and can save your pump.
This pump is loud when in use. It provided me about 9 PSI more than my old (original) pump, but I would prefer a much quieter pump next time. It is about 1.5 timers louder than original pump.
Long story short, it works great and does what it is supposed to do. Just a bit noisy.
384493
It's a great pump for the price, understanding the instructions was a little confusing at first but you put 1 and 1 together and you figure it out. I'm happy for what it does and provides easy cleaning with fast water changes!
4512788
This is the best low cost (around $10-12.00) pump  I have used IF you replace the cheap hose (which as with most others, is too short) that is typically found on such, and quickly cracks. The pump has a large bore, and can quickly fill tires (less than 18 pumps for 2''x2.25 tires), and mine has over 1,000 pumps this summer and  still works well, thank God.

 Buy a 3' piece  of  3/16  I.D.  by 5mm  High Performance  Hose  (about 3.00), and replace the old tube with it. I also made a  base for mine by screwing (thru large washers) the two foot holds onto a piece of hardwood.

Edit. After over 10,000 pumps this is still going strong, with the same replaced air hose, thank God. Only issue is that the top plastic partly broke, requiring Gorilla tape, and once in a while the valve  sticks open so that the air pressure pushes the handle up, and so you have to fight it and push it back down. This only happens once during a session when the tire is almost full, and only rarely, but after taming the beast it  works normally, waiting for another session to escape:)
4458885
I needed a low wattage pump that could run off my ac battery backup and this fit the bill.  It has worked great for about a year now, but I knocked off one star because its started to rust a little.
1950263
I bought a "1 HP" $50 pump on Amazon three years ago and it couldn't support more than one 1/2" hose at a time, and I grew weary of it this year; I needed a pump that can handle at least two 3/4" hoses at a time.
I have a feeling that the Asian knock off pumps are mislabeled on HP ratings and this pump verifies that for me.
Day one(6/2/16): after the trip to Dome Depot and spending about $19 on pipe and fittings I finally got to see this in action and I am impressed.
The pump is as big as the 3/4 HP pumps in town that sell for $250 - $315
The pump had some light rust stains on it, but that's okay as I will sand, prime, and paint it this winter as I had to do with the other cheap pump I bought. I want to paint the front to match the main motor.
The unit has the tendency to tip forward so I used strapping tape to hold it down. I thought about taking the sled/handle off and bolting it to my old pump base but the strapping tape makes for a great hold and will allow for easier removal this fall. Also it would have been hard to access the bolt on the switch side as the switch blocks the bolt.
The pump runs very smooth and quiet compared to the old knock off I had.
The switch has a little neon light in it and makes shutting it off at night easy.
I am using 1" pipe to feed the unit from the foot valve and I reduced the out flow to 3/4" pipe and I can still run two hoses at once without any problems.

My neighbor has an American made 1.5 HP pump and it is twice the size of this and produces two to three times the output as this one; that's why I'm convinced that the knock off pumps are mislabeled on the HP ratings. That's okay, I only need two hoses for now and I don't want an expensive pump.
For the extra $100 - $150 that you spend on a named pump you get a guarantee that it will last ____ number of years and you have the ability to, more or less, service it yourself. This pump is on the more difficult side of serviceable so I wouldn't recommend it to someone who has an issue with that, but I do not foresee any issues on my end.
So far I love this pump and I have already recommended it to other people.
You'll notice in one picture that my yard was dying for this pump as well.
I will update this review by the end of the fall and upload some more pictures as well.
3433405
Great pump!  After months of use, I finally ran the pump dry for at least a few days before I noticed.  Filled the fountain back up, pump still worked!  While I highly recommend not being a bonehead and running this pump dry, know that I did make that mistake without this pump failing.  That 120GPH was an HP to HP replacement, but this pump out-preforms its predecessor. Although the GPH adjustment does work, it leaves something to be desired. For the price, you won't do better.
3555141
A great little inexpensive pump. Actually pumps more volume than described. I used it to drain a 50 gallon gas tank on a boat.
2237148
Great pump! I installed it as a backup. I used the zoeller base to raise this pump higher than the main pump.
4476976
great little tire pump, switch it to presta setting first.  then plan on pumping a while, but it's small and lightweight and a great backup.
549571
I came across one of these at a discount store for about $29 and bought it. Liked it enough that I went down and got another.  The presta connection has to be adjusted properly and then it won't pop off. I use this pump for bicycles, cars and motorcycles too.  I would never pay close to $80 for it but see it and others by JoeBlow around for much less.
1230644
My old $250 oil-filled submersible pump bit the dust after two years. Which sucked, because the $%?!* contractor who put in my water feature made it impossible to get to it. Had to dig out decorative rock and coarse, heavy gravel two feet down and four feet in circumference, cut three outlet lines too short to reattach (had to completely replace two of them), and do some more digging to free the cord from the rocks. Note to all y'all - when you put in a water feature, be sure to make it so 1) you know where the pump is and 2) the chamber or whatever you put your pump in is easily accessible.

Anyway, this one was less expensive, and others' reviews seem to imply it should work for a couple of years at least. Even though it advertises 3100 gph, its capacity is slightly less than the old pump that advertised 2850 gph. I had that old one throttled back a bit, and I'm running this one almost full-out on all three of my bubbling rocks. But it works fine.

I like the built-in screen. I'm not sure, because I had to jiggle the old pump so much to get it out of its enclosure that whatever might have jammed it could have fallen out by the time I got it to the surface, but I think the old pump died because some little stones got jammed behind the impeller. The screen on this one makes that less likely. Although, as several reviewers pointed out, it does fall off easily. I have it oriented screen-down and resting on the screen, so that won't be an issue.

It's very quiet. At 230 watts, it does suck up electricity pretty well compared to a non-submerged pump, but that's the case with most submersibles. The discharge was easy to connect to, and there were lots of places on the pump to grab onto to get it back into its enclosure - the old one had a handle on the top, but that wasn't enough and the rest of it was round and slippery and hard to grab onto. It's been working well for a couple of months now, and my wife, the birds and I really appreciate having a running water feature again.

I'm happy. Try one.