You'll get mixed reviews but a GREAT compromise is a PoolBuster. It's manual but it's easier and faster than a hose. Just get the fine filter bag and, if it seems weak, contact them BEFORE the warranty runs out. Sometimes the battery/motor pack has a bad battery that won't hold a charge. But when it's good, it runs for an hour.

Again, some people have had bad experiences with them but I've been delighted with mine, even when I had to change out the battery at my expense because it was out of warranty.