Reimo sell two primary poptops:
1) Easyfit - Built in frame (hence 'easyfit'), with California-style front spoiler.
2) Superflat - A slightly lower profile poptop, without front spoiler so the curved front section comes straight down above the windshield. The frame is separately installed.
The 'vtec' labelling is newer and rather confusing. It seems to denote the SWB only version of the Easyfit pop top, but I'm not sure whether it actually implies anything different in terms of spec.