After one half year my short report for OSP Expert II CRWi:
I have 2 pieces, 88 gramm 5.45mm (upper limit) and blade with 90 gramm, with custom handle, 5.55mm (according to my wishes). Blade both "S" 157x150mm.
According to the manufacturer, it is about ALL++ blade.
IMHO it's about OFF- with potential to OFF (at least with my weights and thicknesses).
Closest to Expert II CRWi that I know of is Ma Lin Carbon (my copy has 88 gramm, 5.47mm, made in Woodhause AB Sweden Tranás)
OSP blade is harder by feel (medium hard), a tad slower with lower inner catapult.
Composition (probably) : black limba-limba-UD carbon-ayous-UD carbon-limba-black limba
Dwell time: This blade holds the ball very well even during powerspin. It's captive, more than MLC.
Touch: OSP wood has a clearer "touch" than MLC, it works as a "reproductor membrane", very clear feeling of what happened, when the ball was hited..
Stifness: OSP has a some flex, more by higher energy hits
Arc: OSP has a significantly higher arch than e.g. Viscaria or Boll ALC.
Speed: Compared to the classic ALC blade, OSP has lower basic speed, but the difference in powerspin is quite small, if there is any at all.
Club colleague has Boll ALC with T05 2.1mm on both sides, I compared it briefly.
Compared to Vodak Horejsi ALC: Significantly more flex , more pronounced feedback by fine shot. Similarly good feel, but very different.
Spin potential on the OSP: higher than the ALC , MLC , probably only slightly lower than the non-carbon Expert II.
I'm currently playing with Bluegrip S1 FH and Killer Extreme BH.
Both rubbers work very well with these blades. FH has very high rotation values and Killer Extreme has very good control with it, with a good portion of disruption.
Higher arch of the blade allows for more aggressive shots from the BH side with K.E.
Its slight flex on power shots isn't a problem for Killer it's good for the feel of the whole combination. But it is necessary to adapt for its flexy feel.
Kind regards
Martin