Retropia,
Others will argue to the contrary, but in my experience using a Calypso for the past 2+ years, it cleans and rinses quite nicely.
Yes, they use an adequate amount of water
per the design of the machine. Apparently you're not familiar with how Calypsos work. The tub never fills with water, the water level is always below the wash plate. Throughout the wash period and for most of the rinses, the pump circulates a shower of water over the clothes while the wash plate bounces the load or the basket rotates at 60 RPM.
As for rollover, it depends on what's being washed and which cycle is used. The less aggressive cycles - Delicate/Casual, Wool, Handwash - aren't intended to have much rollover, they do more spin-wash than bounce-wash. The designated Bulky cycle is moderate, there may not be much rollover, but the item should get jostled enough to flex the fibers/fabric. The quilts, spreads, & comforters I've run have done fine.
If you'd like to see how they work, I have posted on YouTube a full Normal cycle (in 5 parts) running a set of sheets.
Calypso Sheets Part 1