I was a bit disappointed, mine is kind of slow to syphon & doesn't suck hard enough draining into the tub to pick up everything especially in low tanks. Plants that get sucked in are hard to get out the other end.
I have a 50ft hose so it's a bit of a pita to drain & wind up. Too much bother if I'm only doing a couple smaller tanks.
Still, it's great on the refill & I'm not sorry I got it. There's a definate learning curve, I've gotten better at it, it's been 4-5 months now.