There can be some very minor "stress" leakage (into the Depends), If the bladder is full and I bend over to tie a shoe, for example, I may get a few drops squeezed out. I also try to urinate every 2-4 hours, when possible to prevent that issue. But, I usually go all day on one Depends and just change before I go to bed.
Once you get use to operating the squeeze valve, it works fine, no pain and is very convenient. Adressing one of your concerns, in two tears, I've never had an accident with leakage outside the Depends even biking, running, etc. I hope this helps with any decision you may have in front of you.