Based on general observations and comments:
- Treegloo - at this point, best value for money in terms of quality and customization options. They have been backlogged with orders, sometimes taking as long as 4 weeks, but that's probably because all their cases are handmade-to-order, and that kind of workmanship takes time. Customer service, as evidenced on their Facebook, is generally very good. What I like especially about Treegloo is that they're constantly innovating and improving on the design and features of their cases.
- Portenzo - reportedly taking 4-6 weeks for delivery, but costs slightly more and finishing quality is supposedly better. Customer service is so-so, though: they don't always respond to emails. (I sent them two emails with questions that were never responded to.)
- Pad and Quill - haven't heard much about them, come to think of it. Their cases are marginally more expensive, though, if cost is a factor.
- DodoCase - total non-starter, despite their undeserved reputation. Their iPad2 case has no rear camera port, which is an instant design fail to me. Not sure if their cases have built-in magnetic activation, either. Their ongoing problems with durability of their rubber corners and wood frames have never been rectified going all the way back to iPad 1 cases last year - just Google 'iPad falls out of DodoCase' and you'll see any number of forum threads and YouTube videos complaining about this.