I've been an avid BSE user for a few years. For the iPhone, I must have put over 20 on for various friends and family recently. When I got my 3g, it of course was a no-brainer of what I was going to use for protection.
When I got mine in the mail, I was seriously disappointed to see the two peice back design. I had bought two skins, I applied the first and the lineup on the back wasn't quite perfect so I decided to go it another go with the second. That application was better, but the line still bugged me on my black phone.
I was so disappointed by this, that I wrote BSE a comment on their website letting them know that I feel this is a serious design issue and it could potentially (most likely) bring down sales, and I could not, in good conscience recommend this product to my friends and family who upgraded to 3g's (all of whom were awaiting my results of BSE since they all missed it on their new 3g's) in its current state.
Literally about 1/2 hour after sending that comment, I received an email from the President of the company apologizing for this ( this was at 10pm EST), and the reason they went with the two piece design was for easy application. He told me that they were thinking of releasing a 1 piece design (this was on the 17th), so it looks like they did so. The president was very cordial in his response and told me he would get me out a 1 piece skin to try out. If I do get it, I will be sure to put it on put pics up.
So, in the end, BSE is still a good company, and now with the 1 piece skin's I might start recommending them again if mine turns out as well as the one I used to have for old iPhone.
I would say if you are dissatisfied with the two piece back, to please let them know by a comment on thier website, I don't think they read these forums that much. For $7 a skin, they are a GREAT deal, hopefully they get this issue straighted out and there are more happy BSE users again.