Too heavy?
Not really...it's one of the smallest, lightest heatsink/fan combos to come around. And it doesn't block any DIMM slots in the process, either.

Whoever told you that, told you wrong.
For the price it cools alright if it's for a FC-Celery.
If you intend to oc it, it will still do a decent job, granted not great as compared to an Alpha PEP66.
If you don't mind the twisting motion and heavy pressure applied onto the die itself, it's alright.
And don't worry about the "weight" of a heatsink fan combo. I've tried both Gorb and Alpha PEP66 (currently have the PEP66), and the PEP66 is heavier. If you have the mounting brackets and the slotket you should be fine.