I carry one of these weights at work. That is pretty much my only complaint - it gets real heavy at the end of 12 hours.
The 4506 can be produced provided Smith gets an order of about 40 pistols, as our department found out. It is not in the catalog as previously stated. Not to worry, they can be found at shows and on the net.
The sights are darn good. The trigger, not the best in the world, can be worked through with time. It feeds about anything - our guns have gone through 185 SWC loads, 230 ball loads, and both weights in hollowpoints.
After several thousand rounds since I have had it (issued used), I finally broke a part. Half of the decocker sheared off, it is cheaper metal than rest of the gun.
Politics aside, I would recommend it.