After spending a bunch more time with the software, I can say that I really, really like 90% of it. Here's a few things that I've noticed:
There's a really cool view in Theater View, but it defaults the cover art to a square, presumable because of CD covers. I've seen it mentioned on the forums, but didn't run across a fix. I have hundreds of ripped DVDs in multiple folders, and 98% of them have a folder.jpg and at least one background.jpg that MediaBrowser displays. I know that MC uses database entries for metadata, but it would be cool if it could use existing metadata to populate it's database (MediaCenterMaster, MyMovies, etc)
I hooked up a USB tuner that I had to test out the Television functions. It went pretty painlessly and I got the TV part of it working. What I then noticed was that MC didn't list all of my available channels. Not sure if it was a MC issue or a mc2xml issue. I went to Silicon Dust's website to get a list of available channels in my area, then I went back into MC and manually configured them. That seemed to take care of that issue. I then dug around for a while to find a way to change the EPG. The list version of an EPG is almost useless to me, and the WAF is out the window. I couldn't find a way to get a grid view like almost every guide I've ever seen (WMC, DirecTV, Tivo, etc)
I also have some TV series DVDs that are quirky. For instance, I have HBO's ROME ripped as individual DVDs. Season 1 Disc 1 contains the first 2 episodes. MC pretty much had no clue what it was. Tying MC into thetvdb.com would probably address the issue of not being able to scrape television. So I took that DVD and ripped the first episode into a MKV named something like Rome_S01E01.mkv. MC again didn't know what to do with the metadata of that, but the MKV played brilliantly with no additional configuration, which WMC/MB can't do out of the box.
I can't remember if I had any other issues, but so far, I really like the software and would for sure consider purchasing it if I can figure out some of the things that are bugging me at the moment.
We've been running our HTPC for OTA only for the past few years and Windows 7 with MediaBrowser has suited our interests to a tee. We recently just hopped back on board with DirecTV because there was a lot of stuff that we missed watching. That's the reason that I'm looking at other software, not necessarily to integrate DTV into the HTPC, but to have a great experience with our movies mainly. I'm leaning towards also running OTA into the HTPC again to record local stuff if/when we have tuner conflicts with DTV