I've got a GBH2-26DFR - tens years old now, and a brilliant tool.

I don't use the 3-jaw chuck very often, but for some things - like
hole cutters in heavy timbers and larger (10mm+) holes in steel - it's
brilliant.

I now have a DeWalt high torque drill, so the bosch interchangable
chuck will come out less frequently now - but before I bought this,
the bosch was my tool of choice when I needed something that wouldn't
easily stall under load. Far, far more torque than my bosch 14v combi.

I *can* stall the bosch GBH under load, but not that easily. The
Dewalt high torque drill would tug my arms out of my shoulders first
(and requires some forethought where that could happen).

If you can afford/justify a separate high torque drill, buy that. If
not, get the extra chuck.