I have never used it but, based on other reviews in this forum, I'm sure it works pretty well....
One thing I might mention though is that I've noticed, when a good cheap skimmer comes out, everyone here seems to rave about it for a year or two... then tends talk trash about it later.
I bought an AquaC remora about three years ago for my 29g tank because I remember reading that the AquaCs were some of the best skimmers out there.... now everyone says a different strory.
Then, about a year ago, everyone was raving about the Coral Life Super Skimmers.... now they say it's a total piece of junk.
In my conclusion I'll say that I've used AquaC , Coral Life, ASM , Deltec, Seaclone, and CPR skimmers.... all my skimmers I've bought based on the experience of others.
In many respects all those skimmers work well for what they are... bu you usually get what you pay for. Deltec is , hands down, the best of the bunch that I've used.
So, I'm sure the Octo works great for what it is... but you may want to consider a higher end skimmer (like one you mentioned in your post) that has a longer reputation behind it just to put your mind at ease... It sucks to have to buy a better skimmer to replace one you've already have to drop $200 on... been there, done that.