SMP doesn't get much respect in the hairloss community. Its still the new guy on the block and most people are quite skeptical. Admittedly, its a pretty strange concept and off putting at first.
Most people who loose their hair want one thing... their hair back. Unfortunately, SMP doesn't do that. However, the illusion it creates (if maintained properly through shaving every day and touch ups every few years) is reportedly very undetectable.
I disagree with saltifdoit insomuch as, having even the illusion of a hairline can have a huge impact on ones appearance, simply by framing your face. Someone who has hair and decides to shave vs someone who lost their hair and has to shave are two different things as far as I am concerned (and I believe most of society notices the difference as well).
I've seen hundreds of before and after photos and I think 99% of the people look better after (even though some people flat out don't look good with a shaved head, I think they typically look better with SMP nonetheless.)
There are a few dedicated SMP forums on the web (hosted by the companies who offer the service) where recipients of the treatment detail their experiences. It seems that most people who undergo the treatment are ecstatic about the results. A lot of people report it as being a life changing experience. Of course, not everyone is satisfied but it seems most people are.
Ideally it would be great to have some hair left and use SMP to add density. But I've seen a lot of NW7's get it with nothing on top and it still looks good. Actually, the guys with greater hair loos seem to be the ones happiest with the treatment. I think that's cause most people with extreme hair loss have lost hope and look at SMP as the last resort.
I've been considering this treatment for about 6 months now and its been a very difficult decision to make. Most likely I'll go through with it in the next few months, but I'm still currently battling all the "what if's" that could go wrong. Then I look in the mirror and see the NW7 staring back and I tell myself... do it, do it now!!!
If your considering SMP I'd defiantly recommend seeing it in person on multiple people to determine if its right for you.
Good luck man, keep us posted.