I have had a power survivor 80 for the last 12 years, but would probably buy something else to replace it. Their product service
has not been good.
It has required 2 new sets of membranes at $750/set--the first set was replaced within 2 years of purchase
because I pickled the unit with tank water which had some dock
water in it. The new manual now cautions against this. The interesting part was that when I called up to get a new membrane, they said it would take 6 weeks to deliver it--like they didn't have any stock for their manufacturing line??
The bearing in the pump drive unit got rusty from a water leak after about 8 years, and the power consumption
doubled. I asked for a new bearing, and they said that the drive was not repairable, and wanted $2500 for a new drive. I found the bearing (its called a cam follower) on the internet
for $25, and got it installed with a little help from the engine
room crew on the Ozan, a Turkish ship.
I bought the unit with the idea of running it off the solar panels
and wind/water generators, but it seems like the boat electrical
loads suck up everything they put out, so ended up running the watermaker when we had the motor
on. The two of us use about 5-7 gal/day, so a higher capacity unit would be more likely to keep the engine hours down.