Loved the RF 6B, enjoyed the T67A, haven't flown the unexciting, heavy 67B (all that grp instead of God's fatique free material - wood.
Hope soon to try the 67M MkII (does this have a power lever like the 260M?).
But am concerned that quite a number of the 67C models have been the subject of spinning accident reports, and I well remember an early one with the 260M where the Instructor could not make a recovery after the student had cocked up, and they threw the aircraft away, as this was service flight with parachutes.
None too confidence building. I gave my students spinning in Airtourer (which is a spiral diver after a couple of rotations anyway), and the delightful Pup, which always behaved impeccably, and made the thought of needing a parachute laughable. But not so the Slingby .....