Very easy to assemble. If you want to be super anal it may take a while and you can probably get them closer together, but I got everything down to +/- 3psi pretty quickly. Once you've done that, they're very easy to use. One of them makes a farting sound when they start defecating which is pretty funny but I wish it wasn't. I lubricated all o-rings with silicone grease to ensure a better seal and extend their life. I used blue Loctite on the snap rings so I don't have to worry about them self adjusting. It may not be necessary, but it puts my mind at ease. I have an arb ez deflator that works fast but I prefer the ease of use of these guys over this one. When traveling with someone who doesn't have a deflator/s, I use both. Overall, I highly recommend them and would be happy to buy them again. For the price you can't beat them.
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