Basem,
The only KTM i've ever ridden was a Brand New 1993 model 250 MXbike. That was when they were trying to make a resurgance in the market place. It was the first decent bike I saw come out of KTM in a long time. Still though upon resale used, finding a buyer can be tough. Hondas have always been First pick in the used MX market. The Exotics like KTM not so much, they have made alot of improvement in reestablishing themselves over the last 15 years.
Ktm , has a reputation of excessive vibration on some of their models. I've heard alot of this mentioned over time. While they offer some big power increases compared to some of the competion, sometimes riding a Pumpkin aint cheap keeping on the road. The Best Bikes IMO and cheapest to maintain, still say made in Japan.
I have looked at KTM , but with the falling dollar they are expensive and I would not risk one as my primary bike, or Id atleast be somewhat scared. I had a Kawasaki once that crippled my pocket book, so I have to be very careful what I buy, since even the best can fail.
If not your primary ride and you got the money, Go for it!