Parica and Jeremy Jones play or played with Schulers. The hit, in my experience, is the most stable and vibration free. I assume it is his "perfection joint" but the cues do seem different than any other.
Schuler cues are hugely respected in the Carom community and the shafts are interchangable. Thus you could order a billiards shaft and play 3C with your cue.
Collectability goes toward the older Ray Schuler cues, rather than the current "SLC" or Schuler Legacy cues. They are built the same way but some collectors prefer the cues made when Ray was alive. The SLC denotes cues made after his passing.
Customer service was very strong at Schuler cues when I last needed some help. They took care of a joint pin that I bent (my fault) and got the cue back to me quickly.