If you can justify the price, do it!
As I have long hair, the problem with a lot of the sets is that you end up not using half of the rollers, just the largest ones - and then you don't have enough of those to do your whole head at once. One of the key benefits of the Cloud Nine system is that it's modular - you can customise it completely to suit you. And the big cost is really in the pod - the additional rollers and clips are pretty reasonably priced.
I agonised over what to get and I don't know quite how I managed to justify it, but I took the plunge and bought the Ultimate Set and packs of additional 30, 40 and 50mm rollers plus clips. Yep - I went the whole hog - enough to be able to do a whole head in each size if I want or mix them up. In for a penny...!
The marketing material sings the benefits pretty well - 4 sec heating time (which is actually accurate), indicators on the rollers, cool touch straight out of the pod, etc. It's pretty nifty. Beyond that, I find this to be the perfect system for silky hair, which can be hard to roll onto the smooth surface of hot ceramic rollers of other brands. Velcro is so much easier and faster as my hair doesn't slip off. The Ultimate Set comes with enough clips for the rollers (8 x size 1 for 20/30/40mm, 4 x size 2 for 50/60mm) - you don't strictly need them if you've wrapped tightly onto the rollers, unless you plan on walking around a lot while they cool. If you're sitting still, the velcro rollers stay in place pretty well.
As expected, you get gorgeous bouncy curls and a salon-style blow wave finish - and you'd want that for the price! You can definitely get the same finish from far cheaper roller sets - what you're paying for here is the fast-heating innovation, the brand name and the benefits of the modular system. If those things don't interest you, I wouldn't recommend this system because there are so many cheaper options. Also, the Ultimate Set is geared towards long hair (the 50mm rollers are pretty big) - if you have short hair, you might think about getting the pod and more of the 20mm rollers, which aren't included in this set.