Hi, just signed up to HTC dev to see what's going on with bootloader unlock, I started the procedure but told me it wants to delete everything on my phone, bugger that.
This is HTC official root method, it says you can load custom rom's and change the recovery but it is still s-on to protect the radio and sim lock (network).
Now if u are not already rooted then its gonna make it hard, esspecialy to backup, however we still have revolutionary temp root to backup with titanium.
For those already rooted, I'm not sure if there is any advantage, except you can flash custom recovery, we have fakeflash so not much point IMO.
Oh, just realised it gives unrestricted access to /system folder so that might make it worth while after all..
Sent from my HTC Legend using XDA App