No, I'm pretty well convinced that they are as useful as a wet sack of leather is sharp...I've been using them since the original Fiery 125. We thought we were having machine problems with KM unit. Every Fiery we dropped in (our Fiery's seemed to mysteriously stop working) had the same color consistency problems. We got a hold of the Creo, did the calibration, created the queues and started production. Same as the Fiery's we brought in. Over the week we re-ran jobs where we had samples from the multitude of Fiery's. We couldn't get consistent color off the Fiery's. We re-ran Fiery jobs on the Creo at the beginning and end of the week. The color was consistent with the Creo after a week. And we're still talking about the exact same KM unit we were having color consistency problems with. It's not even a matter of good or bad quality of printed material. We couldn't get consistent anything. With the Creo is was consistently good. Be consistently good, or be consistently bad. Just be consistent. In my experiences the Fiery was not consistent.
I'll never run a Fiery again, I'll. Never suggest one again unless I can physically see one running consistently well. I haven't had that happen since the Fiery 125, and that goes way back before Creo. Like I said, if it can be demonstrated to me that my almost 15 years or so of experience is wrong then I'd be happy to change my tune and whole heartedly suggest them. But so far I haven't seen that happen. I'm still waiting.
It's kind of like Quark versus Adobe. Quark is a geat tool, just that there are a lot of flaws that consistenly cause problems. I loved Quark 4, but every version since has consistently been disappointing.
As for the Mac versus PC debate, I'm of the mind that it both platforms are solid environments to work in. The idea that "Macs are better for grapics work" is irrelevant now and has been for years. You can just as easily create a quality design on a Mac as you can a PC. That, Mac vs. PC is a religious war, pure and simple. The Fiery's, that's my historical experience...