I would not recommend a Cover Valet. If you want a similar lift, go with the CoverMate line.
We've had issues with the Cover Valets breaking or not fitting on snugly, or even ripping the seams of the cover at the fold. The only lifters in the CV line I've used and had decent success with are the Rock-It, Genie (both for smaller tubs), and the Cover Caddy.