I have the kent pro scraper, im not sure whats so pro about it but it works great. Infact, could you imagine a pro-algie scraper. How sad is that, "that looks like a job for a pro, move aside peon".
Anyways, the long handle means i can access the whole tank without putting my hand in, and the metal scraper hasn't crapped out on me yet, unlike razorblades that need pereodical replacement. Also it doesn't rust, and i dont think you could cut yourself with it. Im happy with it, but id prefer a magnetic one that i could whizz round with daily.