I just got mine mid may and so far I haven't used it much due to the weather.
I have found that it doesn't have enough back focus for my canon 550d, its about 10mm short by my reckoning so i have ordered an extension that should solve the issue.
I have had a little play with it visually and im stunned, views of the moon with a 6.4mm plossl are fantastic, super sharp with great contrast all the way to the edge. I didn't notice any field curvature even though im sure its there.
Last night, I also checked out Jupiter and while it was still very small, I could easily make out cloud bands and the moons were pin point sharp with no visible CA, and I think the seeing last night would have been average at best as I was viewing thru breaks in the cloud.
There are a few little modifications that Iv made to the dovetail to get it to works on my SW star adventure that can dig deeper into if needed.
All up, Im super happy with it so far, Im sure ill be even happier when i can actually image thru it.