There was a period of about 10 years that, as mentioned above, the quality of the phasing harness diminished greatly. I believe this has been addressed, and CommScope has the issue under control. I would have no reservations installing a DB222 in a permanent location that I knew I wouldn't be touching again.
If you really want to get picky, you can loosen the band clamps holding the elements to the mast and coat mating surfaces with no-oxide compound. Even though aluminum and stainless steel isn't supposed to react, it does sometimes in certain environments, and a light coating of no-oxide will reduce or eliminate corrosion.
The second thing - even though I highly respect CommScope's provision to preserve the fiberglass tape to the mast by covering it with foil tape - over the years - 10 or more - the foil tape will begin to deteriorate, sometimes crumbling in the hot sun and then flapping in the wind. Loose foil flapping in the wind causes all sorts of issues, including major duplex noise on your own repeater (if this is for a repeater) or noise for someone (or everyone) else near the antenna on the tower. I usually wrap OVER the foil tape with Scotch 33. This way, when the tape rots off after 20 years, you'll have nice new foil tape underneath ready for another decade of service.
Just a few thoughts. Sinclair and Comprod antennas with enclosed harnesses are even better, but at twice the cost, that's also a consideration.
