I can vouch for the Dyno. Bought a 115liter v4 in November, but have only been able to get out a couple of times.
1st session: Just enough to plane for an hour (13 - 17 knots). All 4 footstraps in outboard position, single 33.5cm race fin, no fin blanks in the slot boxes (didn't have those at the time), Goya 6.4 Nexus rigged pretty loosely. Was able to hit 26.8mph and felt like there was plenty of room if the wind was a bit better. Was open ocean, small chop, no waves.
2nd session: Had board set up for surf mode (2 stock 12cm side bites and a 25cm Drake freewave fin...didn't have the original Severne fin). Still used both straps in back. Wind started off kind of light, then filled in pretty well. Was on a Goya 6.3 Eclipse and could've been on a 5.7 for a little while. Waves were small, but enough to get a taste of how it might feel in better swell. So far, feels really nice in our really crappy waves. Easy to turn and carve. Will definitely not be using the fourth strap if the expectation is bump and jumping/waveriding. Only intentionally tried to bare off for a speed run once, got up to 26.6mph...on a wave sail, with three fins, in small waves and chop.
