I should add that Lightspin admitted that there was a problem with their spring mechanism, and they admitted that the generators weren't very effective in rainy situations, and they admitted that cyclists burned through pulleys like they were butter ... and they mentioned something about trying to fix all those problems.
So it is possible that the new Lightspins, if they've gone back into business again, do work better. After all, it has been 2 years.
If you are tempted by the Lightspins though, I would check to see if what Yellow Jersey is selling is old stock ... or if Lightspin really is back in business again and they really are new.