I use a studio that's equipped with all AB and Einstein strobes. For my home studio and when on location, I was an Elinchrom guy with a bunch of modifiers. In other words, I'm pretty heavily invested in Elinchrom. I now own a Profoto B1 and a B2, and I picked up two Elinchrom adapters to allow me to use my Elinchrom modifiers. I have to say that I'm pretty much only using the B1 and B2 for most things now. No question that the Profoto stuff is expensive, but the build quality difference is very noticeable. Having ETTL and HSS when you need it is awesome. The ability to use the controller on your camera's hotshoe to change lighting ratios on the fly, manually adjust each light, turn on one of the modeling lights when you need a little extra light for focus, etc. just makes things so much easier. And my experience with Canon has been that Profoto seems to do a better job getting the exposure right than Canon does with speedlights! I'll set up two lights, change lighting ratios, modify aperture and shutter speed, turn on and off HSS, mess with ISO, and the histogram will look almost exactly the same (depending on how much ambient light affects the shot). It's pretty impressive. Normally, I'd be out there with my meter to check exposures from my main and fill lights, and I save time with Profoto just getting it right. The guy who owns and runs the studio I mentioned at the beginning has been a Paul Buff guy going way back. I showed him the B1, and he really wanted to hate it...and then he bought one...and recently a B2. Just saying!