Hi...If this is really the case, frankly saying it will mount up to more than $600 of savings....now the trick question is whether the balance 4 years is worth the $600 price tag. Taking into consideration that the lens doesn't need to go for a "yearly" check up.....
Putting that aside, any one every bought from Techno Gadget before? how long will it take before we can get the "goods" after placing order?
Technogadegets have CS account; just PM them and ask.