[Casteil]

Yep - I got a Winix 5300 ~3 years ago and it's been great. Nice and quiet, low power, and the squirrel cage blower in it is really good (which is rather important - you need a lot of static pressure to push/pull air through a HEPA filter and box fans just aren't really up for the task at low levels).

[twisteriffic]

Despite appearing almost identical, I haven't had good luck with the Winix C535. All 3 had poorly balanced blowers that either ticked or rattled, which wasn't the case in the 5 5500/5300 I've owned. It's a pity because they're super cheap at Costco.