The Sensica Sensifirm is an incredible tool on many levels. I've been using it for the last month or so, and have even taken it away with me! Yes, it definitely makes your skin smoother by flattening the layers as shown in the various videos. I used it on particular places on my legs to see the difference between the treated and untreated areas, and the areas where I'd used were MUCH smoother. I stopped using it for a week too, to see if those areas would just "spring back", but they're still as smooth as when I last used it. The gel distribution tool is also the best I've seen - I hate ending up with more gel on my hands than on my body - no more sticky mess with their roller system.
But the SensiFirm also provides a great massage too - I've been using it on my knees (which both need replacing) and the deep vibrations and heat have made a massive difference to my pain levels. During the week I haven't used it, my pain levels have increased massively, which is why I won't be leaving it for longer than a week.
I think the SensiFirm is excellent value for money and actually a lovely tool to use for massage.