I have a ROHO quadro in my power wheelchair, and I just got out of the old chair with a van seat, and into my Permobil with the ROHO, and my butt is saying thank you, thank you, thank you. Sometimes the Permobil chair needs some extra hours of battery charging, so I use the old chair for part of the day. Permobil batteries were at 50% last night when I put it on the charger at 9:00PM.
The charger finally went to float at 1:30PM today.
ROHO all the way. Pressure may be a little tricky to get adjusted to YOUR comfort in the beginning, but play around with the pressures til you get it right. You'll know when that is, bacause if you can sit in it for 12 hours without a buttache, you are getting there.