I use batteries in mine. I never really understood what the big deal is with pulling a plug out of the input or turning them off when they have this option. On my BYOC Bender, the only reason I wired the AC, was so I can put a dummy plug in while not using.
Besides, now I can put my fuzzes PLUS 8 other pedals on my board and still be covered with my PP2+.
It's not just a matter of hum... when using non-alkaline batteries as opposed to pedal power or alkaline batteries, they actually sound more open with a wider tonal response as well. It's a noticeable improvement. There's an a/b clip on analogman's site demonstrating this. Tried it myself as well with the same results.
Batteries rock. I use em in three pedals that are tranny based and they sound excellent. As mentioned above, with PP2+ I get 8 plus 3 pedals. Really I have a power tap for three more adapters and connect then off the convenience plug as well.
Anyway, sometimes I forget the three pedals input jacks and have to change batteries, but it is regular routine now to unplug these few pedals.
Batteries for fuzz always. I actually found that 12V from a power supply sounded equally good with a D*A*M Ram Head (Big Muff clone), but aside from that, all fuzzes get a battery. ODs usually aren't as selective though, IME.
One nice solution if you have a pedalboard permanently set up is to use a battery drawer and then run a power cable from that to the pedal's power inlet. Gives you the benefit of easy battery swapping. Combine it with a battery kill switch, and you're set to go.