I purchased three orbs the first day they were available, and started using all of them after they were delivered this past Friday. I purchased one for my office, one for my home office and one for my bedside table. All three have, for the most part, worked flawlessly. No slippage from any of them, and none of the environments they're being used in could be considered "dust free". In fact, this morning, I looked at the face of the Orb in the bedroom and it was covered in lint. However, the phone continues to stick to the charger just fine. No issues at all.
I'm NOT using the phone bare. It's always in a Ringke Slim case. I'm also running an AOKP 4.2.2 rom.
As far as using the phone as a desktop clock, the Orb is working better than any other inductive charger I've tried. And I've tried many of them including the flat LG, the Panasonic, and a couple of cheapies off of eBay. They would always shut off charging, which made the phone think it'd been unplugged and turn off the clock/daydream mode. Some (like the LG) would restart charging once the battery hit a certain point, most of the others wouldn't. The Orb, however, will shut off charging but the phone will continue to think it's being charged so that Daydream doesn't turn off. The charge level, according to Battery Monitor Widget, will get to about 96% before charging fires up again. Battery Monitor Widget also confirms that the screen stays on the entire time. Basically behaving exactly like it would if it were charged directly into a USB cable.
Now, everything hasn't been entirely trouble free. Yesterday after I woke up, I browsed the web for about an hour before putting the phone back on the charger once I started to get ready for work. No matter what I tried, the phone would register as charging but wouldn't actually accept a current. The percentage kept dropping. So I went to work and plopped the phone on my work Orb. Same thing. It'd occasionally charge for a few minutes then go right back into draining the battery. Phone sat on the Orb all day, and went from ~90% when I got to work to about 20% around 4pm (the screen stayed on virtually the entire time because the phone THOUGHT it was charging). So, in a panic, I plugged the phone into USB to make sure it had enough juice to get me through the night. Once it got to about 70%, I unplugged it and put it back on the Orb. And to my astonishment, the phone started charging and kept charging, just like it's supposed to. I haven't had that issue since, but it's almost like the charging mechanism needed to be "primed" to allow inductive charging to function.
I'd noticed similar behavior before using the LG pad as my bedside charger (which is why I stopped using it and instead used a USB powered dock). Haven't had that issue with the Orb since, and the fact that the Orb is usb powered means you always have a backup charging mechanism in a pinch.. which can't be said for most of the other chargers that rely on a proprietary plug.
Overall I'm quite happy with the Orb, and I'll continue to use it in all three locations exclusively.