After using this case for a day, I gotta say that I'm not crazy about the looks of it. With the Otterbox on, the EVO just doesn't really look like an EVO anymore. Also, I'm not a huge fan of the feel of the plastic back, as I just like the way silicone feels to the touch (soft and grippy). This plastic just feels kinda cheap.
HOWEVER, I will not go back to my HTC silicone case for two reasons: (1) it attracts too much dust and it doesn't protect the ports and (2) the grippiness of the silicone makes it a pain to insert and remove from my pocket. Although I'm not crazy about the looks of it, I ABSOLUTELY love the functionality of this case and the peace of mind it gives me. Now, I put the EVO in my pocket without fretting over getting pocket lint into the ports and under the screen (I had a Hero with dust under the screen so I was VERY cautious with my EVO so the same thing wouldn't happen). Now I just use my phone as a phone and I no longer have to baby it. Also, I haven't had any issues with the bottom flap at all....
In sum, if you are more concerned about aesthetics (looks), then this case will disappoint you because it kinda makes the EVO look like a Blackberry. But if you just wanna be able to use your EVO without worrying about dust and pocket lint getting into the ports and under the screen, then this Otterbox case rocks! For me, it's a keeper.*
*That said, I'll be keeping my eye out for the Otterbox silicone case...