Put me on the TrackMan with my current clubs (Mizuno MX-200s). I spent the entire first session hitting my seven iron, and we noted the numbers. My spin rate on some swings was as high as 11k, my club face was extremely closed, and my distance was around 145. Swing speed around 90-92. We worked a fair amount on getting my hands forward, and weight transfer.
Next session he had built me a TaylorMade M6, one inch longer, with an extra stiff shaft. Spin rate was lower, though I don't know how much of that was the club versus my practicing (I'm getting down into the low-to-mid 7000s now, sometimes lower on really good swings, five weeks later).
Third session he gave me a RogueX, 1.25" longer, extra stiff shaft, =4 midsize grip. Getting around 95mph, 6700rpm, 180+ on good swings now, with much lower disperson than either the Mizuno or M6 7-iron.
At that point I said I really liked the grip and shaft on the RogueX, and thought it would be good to try that setup on the M6 for an apples-to-apples comparison. I also asked if maybe I could try something like the Rogue, Rogue Pro, Apex, or something like that in a TaylorMade, in an attempt to get something closer to my current clubhead, but with the shaft and grip I preferred.
The things I don't like about the RogueX, in descending order of irritation, are: the topline, the feel (it feels like something between my irons and a hybrid coming off the face), the jacked lofts, and the need for more wedges to fill out my gaps due to the lofts. The positives are much narrower dispersion, and much greater distance, but I know that has a lot to do with the lofts.
I had another lesson today, and I'm about to give in on the RogueXs. For all my quibbles, it's hard to argue against the distance and forgiveness of the clubs. Hopefully I'll be able to improve my fundamentals even with the built-in forgiveness of any errors going forward.
Sorry for the length, but hey - you asked!