Is this drill good for heavy work?

Yes. The brushless motor, 1/2-in keyed chuck and 8.0 Ah pack suit large bits, hole saws and long runtime sessions. It is not a light homeowner drill.

Does it come with a battery?

No. The tool is sold without batteries, and the listed charge time of 120 minutes refers to the pack it is designed for. You need an 18V Bosch Professional battery and charger.

Why a keyed chuck instead of keyless?

A keyed chuck tightens harder on large shank bits and resists slipping under load. The trade-off is that you need the chuck key for every bit change.

What does right angle mean here?

The body is configured so the chuck sits at an angle to the handle, letting you drill where a straight drill will not fit. Check the 16.6-in length against your space before buying.

How does it compare with compact 18V drills?

It is heavier and longer but offers more runtime and grip on big bits. Compact drills are easier overhead and in tight spots but give up torque headroom.