Was just shopping around on Ebay a couple days ago and ordered my Canon 60mm Macro, and saw a Tamron 60mm macro F:2, and almost snapped it up but decided I would check the waranty and neither Tamron or Sigma have transferable warranties. My goodness, with all the folks who have to send their 3rd party lenses back for focus adjustment and problems, why on earth would someone take a small amount like a hundred bucks off the new price AND GIVE UP A 6 YEAR WARRANTY? That's crazy.
That Tamron is like $424 after rebate brand new, so I would have gotten about 75 bucks off the new price, and would have been out my six year warranty, can you imagine that? I know in my soul i would have got that thing here and it most likely would have needed adjustment, and i would have been stuck with the price of sending it in and paying for the labor and everything.
This means that Tamron and sigma resale value should be terribly lowcompared to the new price.
I didn't mind buying my 60mm used because it was made by Canon and it was designed to work with my very bodies (450D and 500D) I have much more confidence that when it arrives it will perform as it should, but no way could i feel the same way about buying a Tamron or sigma used like that and lose the warranty. I don't feel likeI would have wanted to spend more than 225 dollars on that Tamron without the 6 year warranty because you are taking a huge risk it seems to me.
Do you guys feel the same? I almost get sick now when I see guys asking only a small amount off new prices on Ebay and realize that these buyers will be on their own if there are focus problems or even worse, hardware faults that need more than just adjusting. You would think Tamron and Sigma would realize this and do something about it. People are less intent on buying their lenses when they realize that the resale value is very low, or should be to knowledgeable buyers.

