I recently had to remove a cast-iron tub. I decided to cut the tub in place, and remove it in sections.
A trial cut using a 4" angle grinder proved the concept - but this job really called for a larger tool. So I chose the 7" DeWalt. My choice at the time was this DeWalt, or a similar Ryobi.
DeWalt calles this a 'medium body' grinder. They hve other 7" grinders that they call 'large body.' Mine has only two handle positions, and will accept only 7" blades; a 9" won't fit.
Good News: The grinder worked well. It was very comfortable; you didn't need to think about where the controls were, I actually held the tool by the handles. Cutting wheel was held securely. I don't remember any vibration.
1) Claiming to be a '13 amp' tool, I did trip the 15-amp breaker a few times on starting;
2) The way the wheels attach can distort a cutting wheel, which might make it break;
3) The nose seems 'fat,' not letting the tool access tight places. In tight spaces you find yourself wishing there were more choices of handle placement;
4) The tool comes in a cardboard box, with no indication that there's a tool bag inside. There is, and it's a fairly decent bag. There's room for a few wheels and other accessories. I doubt there's room for a full-face shield, though.
5) The tool 'seems' to have a decent cord, but you'll need an extension cord to get anything done.
As for the job itself"
1) Safety glasses work, but goggles are probably a better idea. I keep a pair in the bag, with the tool.
2) The tool creates far more dust and grit than it appears while you're at work. A devent respirator is a must, the dust feels like little knives inside your sinuses, and you will have a headache that night. Again, keep the dust masks with the tool.
3) Other 'grit control' measures worth having are a Shop-vac air filter (made a big difference) and a vacuum. You also need to 'tent off' or close off the work area.
4) You won't be able to reach everywhere with the grinder - but a stick a thin pry bar in the kerf, give a slight twist, and the remaining iron will just fall apart.