Ive had mine for over a year now.
The ATO:
non existent... its a joke
The skimmer:
The stock skimmer can be efficient but you have to have an ATO that works (throw the stock bottles out as soon as you get the tank, they are completely worthless). The water level needs to stay constant at full in the back chambers and the skimmer cup needs to be adjusted for it, otherwise it doesn't work as well as it could. Working at its best i would give it a "good" rating. The skimmer itself is fairly cheep though, The plastic is easy to break on the sides when cleaning so you need to be careful, superglue solves any mishaps though.
The Pumps:
They are very quite, the only noise you will hear from the tank is the skimmer, which isn't that bad.(for a bedroom you might have to get used to it, im not sure how it compares to others because Ive never heard another skimmer)
The stock skimmer pump broke on me after about 6 months of use. Ive heard others that have lasted a lot longer though.
The main return pump is decent, but for anyone with a reef tank it will need an upgrade or wave makers in the tank.
The back chambers:
Ive found it very difficult to access these for cleaning if the tank is up against a wall. I usually have to stand on a salt bucket to get my hands back there. If you have a MH light that's high enough off the tank the back compartments will start to collect some algae deposits so it needs to be monitored.
The tank itself:
I put a heater in the skimmer compartment at first but there wasn't enough flow for the waters to circulate to the tank, heater would prob have to go in 2nd chamber or in tank.The glass lid creates a lot of heat issues + it creates condensation after a couple days so it doesn't even look good, i wouldn't recommend using it.
Its my only tank, after having it for so long i want an upgrade because its seeming cramped. But that comes with anyone that loves saltwater i think lol.
So after all the negatives, i would say i still love the tank lol(i might be a bit biased however because its my first real sw tank)... you can do a lot with the back chambers and with upgrades if you have the funds, which i am lacking.
It looks really nice set up and even better with Mh lighting imo.
To get to your question, i think it would be a great tank for seahorses