I personally like the Steadicam Merlin Arm & Vest, but the merlin itself i passed on. I got myself the Glidecam HD4000, and I use that with the merlin vest. That way i can mount my monitor (SmallHD DP6) on the Glidecam HD4000, but i still have the dual spring arm and quality of the Steadicam merlin vest/Arm. I love the setup, its perfect for what I do.
I only do HDSLR stuff obviously, and I havent done anything hardcore enough to warrant worrying about any wireless monitoring or focusing yet.
this is without the mattebox and monitor. just the bare rig and camera. You'll love this photo...
Steadicam merlin vest & Glidecam HD4000