Robert, I would not recommend EITHER the Hyla or the Ocean Blue.
For Hyla: Biggest drawback for me is that it is manufactured in Slovenia. On top of that, to be honest, the vacuum just looks cheap! I would even question the quality of plastic they use to make it. And of course, as another poster pointed out, that electric hose- they are too cheap to include a heavy-duty wire-reinforced electric hose on a vacuum that's being sold door-to-door?!?! They've got TONS of nerve in my books for thinking that's appropriate....
For Ocean Blue: The vacuum is clearly a Rainbow D2 & D4 combined together, with a cheap copy of the motor from the D4. I have read that lots of people are having issues with the Ocean Blue's reliability, mainly that the motors don't hold up & die easily. But then again, what do you expect for a cheap Rainbow copy?! Another HUGE disadvantage for me, is Ocean Blue is not an established company yet, unlike Hyla which IS becoming established, & I would be willing to bet good money that Ocean Blue won't be around to support their product in 10 years time.
Have you thought about Pro Aqua? Maybe that may be the solution your friend's need. It's German made, & the bucket looks big enough that it could possibly be a 4 quart bucket.
Rob