I just had my surgery almost 6 weeks ago and have been using the Hollister 2 piece new image convex drainable with very little problems. I like it for the following reasons...
Waterproof - swimming bathing
Gas - a thick unsnap and snap let's the gas out
You can just change the bag if need be, you get it dirty on the outside or something
Nothing has leaked past the outside wafer bandage so no messes in bed or anywhere else
I will not be changing from this system as it works very well, I am just going to try using adapt rings instead of the adapt paste for a bit
Hope this helps, if you want product #'s let me know....