Chris 249, why would so many prefer to sail on LT rather than an old raceboard, such as IMCO. Personally, I have sailed an IMCO a few times (hiring in a windsurf centre). I think IMCO is much more efficient in all wind speed with an adjustable mast track. since the CLR is different with centreboard up or down, changing mast foot position can keep similar mast rake angle of the rig. (Track forward for CB down, back for CB retracted). Once powered up, the sail is rake back most of the time. With an LT, the mast foot position is a compromise. Although I have no experience on LT, just be watching videos, it seems too far farwards for centreboard down which requires a very upright rig. Too easy to round up in strong wind and get slammed.
With footstraps (at least 7straps usually) one can easily control raceboard in chop and high speed without bouncing off. I also find it quite easy to turn once fully planing. It carves like a shortboard
Overall, I would say that old raceboard is much more technical and rewarding. LT is probably better for learning because of its soft deck(?)