That does look quite nice. The app listing/screenshots are a bit sparse on detail though, it'd be quite nice to see the following.. Or if they're already there, you should add notes in the app listing

* dvb subtitles - absolute must for me
* lots more info in the OSD would be nice, right now it only has title; how about start time, end time, a seek bar, whats on next, codec info, etc?
* a timeline along the top/bottom of the EPG grid, hourly time markers
* some sort of highlight for the program that is on now on each channel (MediaPortal for instance shows them on a slightly brighter background, its only a small thing but it makes the guide so much more readable)
* highlight in EPG grid for timers/recordings (maybe this is already in, but its not shown in screenshots)
Also as I understand it DVBLink v6, due out soon now, also includes an ATV4 app so it'll be interesting to see how they compare. Nice to have a bit of choice!