Tamron - Never Again!!!!
I sent in a 28-300 that I bought spur of the moment at a show in Tampa in May of 2008.
2 weeks back when putting it on a body the focus ring felt loose and later in the week you could literally take it off the lens.
They claim "force or shock damage". The lady I spoke with says the damage could have been caused by something as simple as the lens "bumping" something as I changed from one lens to another.
I didn't yell or scream (maybe if I would have it would have saved me my $225.00) I simply told her what she said was ridiculous and if her glass was that fragile my money in the future would be better spent somewhere else.
Sad because I have always liked this lens and it has performed pretty well.
Thanks for listening I feel better now.