I've been reading on my PB360 since Xmas and love it. Compact size, ease of use, ultra-fast page turning, and an incredibly good FBReader implementation make it a dream to use.
I prefer FB2 format for most books, and frankly despise ePub, but this little baby actually makes ePub seem almost OK. Add to that the ability to open non-DRM ePubs in FBReader and you have almost all of the advantages of reading FB2, with perhaps a little worse formatting.
Mergers tend to mean compromise to some degree, especially when the companies are offering similar product classes. I would hate to see the excellent PB devices get dragged back down to another level. And I certainly hope the firmware development keeps a significant East Euro (Russian/Ukrainian) group in place, as these guys seems to know how to make good user firmware (first and foremost they support FB2 development, and they seem to do a better job with the rest of the formats as well - the LBook firmware was usually superior on the Hanlin V3 clones).
Here's hoping the commercial benefits don't kill off the great devices PB currently have out there - I'm glad I got my PB360 before this happened! Of course, I am always hopeful of a pleasant surprise...