The i-Stubble is a great product with a couple issues. My neck is crazy sensitive and when I used a blade razor (Mach 3) my neck would break out in a horrible rash with the odd ingrown hair. Also, I'm pretty much bald so I shave my head, but when I used a blade razor they'd get dull in about 2 shaves, which is expensive with the blades pretty much $5 each. I got the I-stubble for x-mas and I love it. You can set different trim lengths, so I use the longest level for my goatee, and the shortest everywhere else on my head. At the short level it cuts very close, so it just looks like a 1 or 2 day shadow.
Here are my issues, with only one being a real drawback. It's a rechargeable razor, but it doesn't have protection for when you keep it plugged in between shaves, so now it's no longer rechargeable. So, in less than 2 months the battery was toast (I should have known Conair wouldn't make a razor that didn't have some issues, but most of their products are in the $10-20 range). The only other issue I have with it is that there is no sort of case, which I hate when taking it anywhere. The floating head needs some sort of hard protection.
All-in-all this is a great unit, which I have told friends