I haven't own any of the previous models but the SRX does have power to clean. Even using the longer 14ft hose I had plenty of suction power to do my hard to reach cleaning.
I am curious to see what rexair has planned for their 85th anniversary, which is this year. Hopefully some new accessories. I'm hoping they come out with a soft roller head kind of like what dyson has for their cordlesses. I also do hope they come out with a dog bathing system, kind of what bissell has done with the biselle barkbath. I also do wish they come up with some additional brushes for the MiniJet, Kind of like a spinning turbo shampoo brush, kind of like what Hoover has. There is potential for new accessories, Lets just hope rexair has some ideas for new optional accessories.