Pros: Good performance, good hose routing, excellent.
Cons: I can't think of any con's of this regulator ;)
Got this regulator when looking around for a cold-water reg to supplement the "workhorse" of my kit: the AquaLung Titan LX. I'll first note, that I was and am very pleased with the Titan LX -- a compensated reg that has served me well as primary, backup and stage regulators for a long time. I had heard good things about the Legend series, however, so when looking for a cold-water reg I decided to give the Legend LX Supreme a go.
The Legend LX series are overcompensated regulators, which means that they do breath very easilly under virtually any condition I have been at. Even if you should breath the 2. stage "inverted" (upside down -- either because you stuff it in your mouth wrongly or because you're upside down), it is remarkably dry. Many other reg's breath wet under these conditions.
The reg. 1. stage has a nice layout of HP ports (2) and LP ports.
I won't repeat the manufacturer specifications here, I'll just say that this probably is the most comfortable and best reg I've been using in my years of diving. It's a regulator that works very well and reliable, performs good at depth and allows for nice hose routing.
Notice: key to a well performing reg is to keep it maintained. Either learn to maintain your regs yourself, or bite the bullet and have it serviced by a technician you trust every 100 dives or so, or yearly -- whichever comes first.