So I am considering using unrevoked to flash/root my droid incredible and I just had a few questions. How safe is it? Is it easy to brick during the flash process or after when its already flashed? If my phone does somehow get bricked is there any way to save it? Is it reversible? If so is it easy? And lastly how does unrevoked run? I have stock 2.2 and its fast and smooth. Would using unrevoked slow it down?
Just to reiterate on what Dan said, it just unlocks the phone allowing you access to change your ROM, which is similar to a Theme but different. Also allowing you to change your kernel which may help your phone run better with less battery usage as well as making system changes like removing bloatware and more. It also gives you the opportunity to run root only programs such as Titanium Backup, Adfree, Cachemate, SetCPU, Wireless Tether, etc... If you like experimenting with better setups as you would on a computer and enjoy making things to conform with your own setup and liking then I would recommend you root. If you just want something that runs and gets shit done, I recommend you keep your phone stock but definitely consider rooting.
There is a process that will allow you to unroot if you have a warranty issue, it's pretty simple. Just flashing of a zip file through HBOOT and you're practically done. If you're warranty is up or you don't have one (like me) then you can just use Assurion and tell them you lost it so you can skip the step of having to unroot.
The only way you're really going to brick your phone is either, during unrevoked, unrevoked forever, messing with HBOOT (IE: HBOOT version or Radio version) or oing a battery pull during a system flash (flashing of rom, kernel or something of the sort) If it happens, it'll probably be a user error but again, like Dan said, it's pretty rare for a user to brick their phone. Once again, if you brick it, you can always use assurion saying you lost it. Win for Total Equipment Coverage, hehe.
Unrevoked is really simple, you do all the prereq's then plug in your USB, one click, wait and you are rooted. You will then probably want to back up your system by doing a NANDROID backup (backs up the state your phone is in at this time, including all texts, phone calls levels beaten in Angry birds, lol.) through Clockwork Recovery then mess with your phone however you want. If you get into a boot loop or something won't fully boot up then you can just reboot back into clockwork and restore your previous setup. EZPZ, heh.
Through my own experience, I bought my phone at the end of August and rooted 3 days after getting it, although I was nervous about what I was doing I don't regret doing it for a split second. Just go with your gut feeling and if you're not sure, research it more or ask someone.
EDIT: Although it may be outdated, I would read through this to give you an idea of what rooting is and how easy it truely is:
Howto: Root the HTC Droid Incredible - Technology - Jonamerica.com