OK, just fired up a little test panel to DIRTYPCBS, I'll report back when they arrive (I'm gone for a few weeks, so probably a month from now)
Apr 2: Order received
Apr 4: Order in production
Apr 9: Order shipped (from Hong Kong)
May 19: Received in Canada <grrrr Canada Post>
Panels look pretty good, in fact very good. I specified an unusual solder mask (yellow - no extra charge), and they still shipped in a week. It's not a complicated board (DIP, 0805, SOT23s), and the only comment I have is that it appears that some of the vias are tented and some aren't (random board to board).
Still waiting on some Ali parts for them, so I would expect in the next week or so I haven't made a board up yet, but for the price I'd use them again.
For smaller stuff I'll still go purple, but for this test the boards are 58x88mm, and I got 12 of them for the price of 10 - Yankee$24.95 incl shipping. For OSHPark that would have been $40 for 3 boards.