I use a Stratus 8mm in an f5 dob, and while I do not claim to be an experienced observer in the nearly 2 years that I've had this ep it has seen a lot of use.
I find it quite acceptable, I enjoy the long eye relief and the wider angle view (68°) and I have no plans to replace it with anything else in the forseeable future.
(Unless I win lotto, or prices on Pentax XW's suddenly drop significantly!)
Cheers!