Cork is an outstanding product. It has it's draw backs which you MUST understand (and then accept) to be able to live in harmony with your cork flooring. There is a reason why only 1% of the world's flooring purchases are cork - it is quirky.
A floating floor will go down quickly and easily. But the manufacturer of the floor needs to be considered before purchasing. A "good" cork floating floor can accept more polyurethane as it ages. Cork is soft which means it has a tendency to "wear through" the finish must faster (like jumping on a bed that has sheets on...you will eventually tear the bed sheets because of all the stress) than hardwood.
That being said, a floating floor that is ALLOWED to be refinished (it is actually a refreshing of the finish) is worth it's weight in GOLD. Your 10 year finish now turns into a 30 year floor. The finishes often need to be reapplied every 7 years or so...but that's what owning cork is all about.
A glue down cork floor is the BEST of the best. It is also VERY expensive ($15 - $25/sf for material and installation = entirely normal). And the glue down is also SUPER SENSITIVE to what it is being glued TO...old concrete sitting on damp earth = don't even try it.
Assuming you can glue down and assuming that you can afford the glue down option, then it is the way to go. A glue down cork floor has the ability to 'live' for 80 - 100 years. In fact, there are hundreds of cork floors in public places that are WELL over 100 years old (Library of Congress received their cork floor in the 1890's = 120 years and still going).
Again, the finish needs to be refreshed every 7 - 10 years...but as you add more finish, the less you need as it gets older.
If I had the chance to put down a glue down cork tile, I would work with Duro-Design cork:
http://www.duro-design.com/index.cfm/cork-flooring/
And I used to sell competing cork products...my stuff was good, but compared to Duro-Design, we couldn't hold a candle to them!
Q