I have got synthweaving up to 400. Being only level 46 it is useful to me and will be until I craft the Rakata purple gear. After that – who knows? There is much comment that at this time Biochem is the best end game skill. It does indeed look great, although there is a change (nerf?) coming soon. I hope and expect that they will add new recipes or enhancements to synthweaving – like the threads and embroideries in WoW.