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I had an extremely mixed experience with Nikon, Mississauga recently. My 24/1.4 fell a few feet to the floor and had a slight bend in the filter ring. Otherwise it worked flawlessly. I really wanted to be able to mount filters on it so I took it Nikon where they said the part would be $70 or something like that (dealing with a parts guy, Bob, who was really great) and should only take about 45 minutes to fix, quoting a little over $100 in labour. It took a full year for them to get the part in after getting the wrong part in once. That was partially due to the tsunami, but a year is a little crazy.
Anyhow, once it finally got in, I brought my lens to them and then had to speak with the "service guy" (long-haired dude who's not stellar from what I've seen) who said it would be $650 to repair because the lens had to be disassembled in order to maintain warranty etc. and could even cost up to $1,100 if they found more damage. I got really frustrated and was about to walk out when the parts guy asked me to wait, went to the back and then said they'd fix my lens for the "minimum service and adjustment fee" of $240 or so.
Around a year ago they switched over to have that 3 tiers service fee structure; around $250, $650 and the over $1,000. So if you take a lens in, you're looking at a minimum of $250, it seems.