I've been using the 2 piece systems. I used Hollister for years and changed over to Convatec after having rash issues. Been on the bag now for 16 years and I can honestly say that I stink.
My output is medium to loose and has an octane level that is off the charts. I built an outhouse to do my business outside. Its a two holer, one for regular folks to sit on, and for me its a round hole in the floor. I simply stand over said hole, unclip and then bombs away down the hole and I am done. No smell at all in the house, and best of all no mess in the inside toilet.
I don't do much to my bag. I change it, and usually get 5 to 6 days out of it. I don't ever remove the bag between flange changes, I just simply un clip and empty out, clip back on, wash hands and go about my day.
Traveling on the plane brings up a real serious issue of controlled gas release. It often fills up no warning real fast, and there is no option but to air off the bag. I try to be discrete, I don't want it to pancake in mid flight ( I talked about the incident in another thread). So when the plane stinks, chances are it came from a patient like me. Not going to let that bag stop me from engaging in life.