So, I purchased an 850lbs sack the other day to grow my surf wake. My old Straight Line 350's and Sumo 250's weren't cutting it, so I cut to the chase and ordered a 475... Since that wasn't direct enough, I order an 850 too the following weekend. I also got the new Sumo Max Fill pump, since my old Sumo Pump (the white one) was pretty slow to fill up even the 250's. (takes about a little under 2m40s to fill it up completely).
I have to say... I won't ever look back switching to their new throw over pump...
I did a video review here for anyone interested in watching the sack fill up an 850 with a throw over pump.

https://www.youtube.com/watch?v=Zhjr...ature=youtu.be

I will say this... The first time out on the water with this, I killed the ignition switch on the boat. It draws quite a bit of amps for an older boat... Luckily, I always carry spare 12 gauge wire and crimpers, so we didn't get stranded on the lake. Test it on the trailer, if you can... Trust me.

They say these pumps are reverse compatible with older bags... I'll have a video reviewing just how "true" that statement really is...