As for the bike itself, I've read a review that compared the TE511 to the power of a DRZ400 (no joke-
http://www.enduro360.com/2012/04/05/uncharacterised-posts/2012-husqvarna-te511-test-page-2/) "So how does it stack up against the competition? We can’t put the TE up against a KTM, any KTM, it just is not on par in any performance comparison. I did one full day of testing alongside my old 2006 450XC. The XC had the Acerbis six gallon tank mounted because it had to carry fuel for both bikes. In nearly every facet, the old KTM out rode the Husky.
In terms of pure performance: power, weight and handling it is probably closest to a Suzuki DRZ400. Yes, it has more motor, but only once it is opened up. The Husky has better quality components and is much, much cooler. Yet, in terms of all around performance characteristics, it and the DRZ are pretty close."
It's hard to find a unbiased opinion on any bike. Not too sure how that reviewer had their bike setup. Durability is up there if you take care of it like most other dirt bikes.
Best to test ride it and see for yourself.