Let me start by saying I have never used better versions of these and this was my first attempt at using an auto emptier. I pre-set all 4 houses to 18psi before going to the beach and setting it to the desired pressure is very simple and easy. Their bodies appear to be well built and the spring seems strong enough to last a long time. When I used them they worked properly and let air out, but I had to watch them when the tires went off. One stuck about 10 pounds over the set pressure and I had to pull on the deflator stem to keep it going. The other went 3 pounds at preset pressure and the other 2 stopped at a pound or so. Overall I'm happy with them but would advise keeping an eye on them for sure but as I have and use them 3-4 times a year I'm totally happy with them and it's better than being on for 30 minutes 4 hoops to kneel.
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