ive only used meprolight so i can't really compare but they seem nice.
Its not hard to do the install yourself. It's fairly idiot proof.
The tool comes highly recommended but it can be done easily without it. I have free access to a sight pusher during regular business hours but have only been patient enough to use it once.
Don't go overboard hammering here, it really doesn't take much force.
Sandwich upper between blocks in vise.
Use another block held firmly against factory sight and TAP block with hammer to drive out the factory sight.
Put a little red loctite in groove.
Slide new sight in as far as possible by hand.
Hold block against new sight and TAP block with hammer to slide new sight in place.
I use calipers to measure and get sight perfectly centered.
From my experience the only bonus of the tool is it makes fine adjustments easier centering the new sight.