I got these for my whitewater raft and quickly realized that I used spent a lot of time letting air out and re-pumping my boat. Periodically going around and making sure the tubes weren't too tight. There is certain peace of mind that goes along with actually knowing what the pressure is at any given time and at a quick glance. Definitely recommend these.
I didn't realize how much time I was spending messing with my boat pressure until I installed these little guys. Turns out I had no idea what my pressure was, and I don't need to pump every morning and deflate every afternoon. Now I can just glance at one or two of the gauges and know where I'm at. It's also been fun talking to other boaters about them; not a single person can walk by at the ramp without stopping to check them out :)
I can't believe I have never had one of these! We all inflate to the perfect pressure, but then the board or kayak goes in the water and we don't take into account the water temperature or mid day sun, which can change the PSI significantly enough to cause unnecessary stress on the seams. I often leave my board inflated for a few days, and sometimes I wonder if that extra drag is from under-inflation or just a low energy day. Never again - the AirCap is hard to miss and always accurate. A brilliant accessory!