The Heckler is a perfect All Mountain bike.
Not too heavy for cross-country trails and just beefy enough to handle the downhills.
All the components are good quality too, but if you want better, then go for the X-9 build.
Front shock can be locked-out, rear one can't.
The only minor problem I had was that the shifting cables did stretch, so I did need them re-adjusted after a few weeks. The shifter does have an adjuster which makes it pretty easy.
Quick note: Pedals are not included on the bike, so make sure you have your own.
Overall: Great bike and well worth the money.