A bit of warning to anyone who wants to follow this guide. BACK UP THE CONTENTS OF YOUR MICROSD CARD FIRST BEFORE YOU DO ANYTHING IN THE OP!
For my HTC Sensation, by following the guide in the OP (as well as help from members such as rzr86 :highfive

I was able to successfully unlock the boot loader, set s-off, flash a new recovery, and get permanent root. Not to mention as well as being able to easily flash custom ROMs.
Since I seem to have the hang of it, yesterday I tried doing the same for my girlfriend's Sensation. Everything worked, but something went wrong.

After doing the wire trick (which worked) I was then going to remove the temp root and that's when I saw the phone no longer recognized the 8GB microsd (unable to determine filesystem type). I didn't remove or touch the card while doing the wire trick. After removing the temp root and flashing the new recovery, I took the microsd card out of the phone and placed it in a card reader on my laptop. Windows said the card needed to be formatted

. Before doing anything to the card, I followed a guide mentioned
here. The card was saying it only had 128KB total capacity

, when it should have been 8GB (or 7.90GB or something along those lines). My instincts told me to back up her stuff on the card before doing anything to her phone since she didn't have backups of anything on the card. Fortunately, I backed up her contacts, text messages, calendar, notes, ringtones, and documents.

But what I didn't backup was her videos and pictures, mainly because I didn't back up anything on my Sensation when I had followed the OP guide and my microsd card was fine after the whole procedure. So I thought it would be pointless to back up the pics and vids on my girlfriend's microsd card since everything went fine for me. I thought it would be fine for her phone too, but boy was I wrong.

Now I wish I did back up the pictures and videos. I'm pretty sure the files are still on the card though. Just now have to spend time trying to recover them.