I recently, heh yesterday, got a set of MX-25s.
I demoed them and ordered the set from a local shop last tuesday.
The demo/fitting club that was closest to what I bought had the Dyna-lite shaft. I kinda had the same impression as you, the club felt "harsh" also ot felt not quite as solid in the swing as I wanted. I checked out one of their blades with the Dynamic Gold shaft, which felt much better and is what I ended up ordering.
After spending a few hours at the range with them I definitely made the correct choice. They Dynamic Gold shaft just feels smooth and the clubs feel nice and buttery on well struck balls and not bad at all on miss-hits (cept for a bladed ball).