I've been using the massager for about two weeks and here are my thoughts:
Pros -Pleasantly surprised with the amount of kneading power coming out of this massager. -Shiatsu function actually works and you can definitely feel the heat. -Very easy to store away when not in use. The massager is lightweight and the seat folds up. -Flexibility: can be used on a chair or can be laid flat on bed if you want a stronger massage.
Cons -Only comes with one velcro strap on the back to hold to chair. This is problematic because the massager can slide forward if the chair is angled. I managed to fix this because I have a spare large velcro strap and I used this to tighten the bottom of the massager to the chair. You can easily find one online.
Overall, it's a very effective massager and my neck and shoulders feel relaxed after a massage. If you're not getting enough kneading strength you can add a cushion between the massager and the chair, my computer chair is curved so adding a cushion improved things a lot. If Renpho can add the additional velcro strap to the chair (or even throw in one in the box) they will earn my 5 stars.