CAUTION CAUTION CAUTION!!!!!!
Before you apply this RUU... you MUST be cautious!!!
Once you install a new base RUU, you CANNOT run a previous one. So, you're stuck with the new version! period!
Also!!!!!!!! and most importantly!!!!!!!!!!!!!!!!!
If this is not an official release, then you may end up getting your phone stuck on this version until HTC releases an RUU for a NEWER version!
What I'm trying to say is that if you put this on your phone, and for whatever reason the next (or any future) OTA doesn't recognize this exact version number, you cannot download and apply the OTA. That means your phone will not be able to be upgraded without applying a new RUU (preferably an official release).
Let's say your phone has version 1.0 and MR1 was version 1.3. There is an official upgrade path from 1.0 -> 1.3 and that's supported by the OTA or the MR1 RUU.
Now, you've got 2.0. Let's say the official release is 2.2. Then there's an OTA released for 2.35. There would be an upgrade path from 2.2 -> 2.35 BUT NOT NECESSARILY FROM 2.0 -> 2.35.
I cannot guarantee that this would happen, but you must be aware of the risk before you run the RUU!