I tried hypo and copper and I lost fish both times. Copper - was my own fault. Didn't know you can't use Amquel at the same time.
Hypo - for some reason I could just not keep the pH up.
I've been doing the tank transfer for over a year, going on 12 fish, haven't lost one yet and so far has been 100% effective.
I understand not everyone has the room for it, but it sure beats everything else I've tried. For actually transferring fish, I syphon out everything but 3" or 4" of water and gently use my hand to catch them. This can't be done safely with every type of fish, but everything I have has done great with it. They don't seem to mind, no thrashing around like you see in a net. It's my first choice for sure for ich treatment or QT.