I ended up using the SensSlip. I had been wondering about the sensitivity issue thing myself for quite some time. I was also circumcised at birth and it seemed to take a lot longer for me to reach orgasm through penatrative sex when compared to others. It took a while to be comfortable with the whole idea of wearing the SensSlip and figuring out how to get it on, but it has been worth it. I noticed some improvement in sensitivity within about a week, but after a couple of months... wow. I absolutely love the extra sensitivity and I even enjoy the simple pleasure of masterbation a lot more now.
It is sensitive enough now that I cannot wear nylon underwear to bed because I wake up in the middle of the night from noctural erections. So instead I stick to cotton. And when I have forgotten to put it on and do a lot of walking that day, I become very aware of my penis brushing against my boxers. I guess maybe there are some downsides to being more sensitive.

For me, it is well worth the trouble and expense.
If you don't want the expense of wearing the SensSlip, then try naturally restoring your foreskin. Do some googling around. You have to be VERY patient as it can take up to 2-3 years to get the coverage that you want. If anything the SensSlip might be a good idea to try out if you plan on restoring your foreskin.
If you do end up trying the SensSlip, make sure you get the right size! Measure several times over a few days and get the trial pack. Anyway, good look. I hope I answered your question.
P.S. I would recommend talking to your wife/girlfriend/boyfriend before using it. I made the mistake of not doing that and ended up in a very awkward situation for a moment. LoL. I got to a point where I didn't even think about it and he ended up reaching down my pants one day. Lets just say he was shocked. After talking to him and some time, he is very understanding and is also suprised at the improvement in sensitivity. He doesn't want me to restore my foreskin, so I'll just keep wearing it.
P.P.S. Most people don't seem to be mature enough to talk about this issue or product.