Buell's were really an advanced bike for their times and obviously well thought out in form and function, unfortunately, they were marketed at Harley Dealer's and HD only concentrated on non-Buell promotion and sales.
I am/ was a fan of theirs and had a new 2010 Buell 1125R, the one with a non-HD engine, and very fast and a competent supersport bike. This bike is the basis for their current offerings. (don't apply unless you have lots of fast bike experience!)
The Sportster based bikes were/ are very easy to maintain, with a super and proven engine in them, where parts are available everywhere and they have hydraulic lifters so no pimple faced, pre-delivery HS kid is adjusting the valves like on other makes!!!!
Buell should bring back the Sportster based bikes at a good price point for the masses!
I was interested in the Buell when they first came out but really didn't like a V-twin sport bike. I opted for the Street Triple because it got so many great reviews. I'm so glade I did get one. It hasn't disappointed me at all.