I recently purchased the PRO to go on my Colt and so far it has been great. It comes assembled with the mount which allows co-witnessing. It was easy to attach and only took a few minutes to zero in. It appears to hold zero fine and seems fairly rugged, but then again I am just a recreational shooter.
A major source of objection to a free economy is precisely that it ... gives people what they want instead of what a particular group thinks they ought to want. Underlying most arguments against the free market is a lack of belief in freedom itself.
- Milton Friedman