I suppose it goes without saying, and I certainly don't mean to sound like an "I told you so" or as though I'm gloating over making the right decision, cuz I didn't.
I looked at the great prices on-line and almost went for them!
In the end I went with the cowards way out and walked into solid B&Ms for all of my audio electronics purchases over the years. Even went so far as to get the extended warrenties for extended peace of mind on a number of the items.
I think I may have thrown a lot of money away though, cause I've never had to use any of the repair services
Anyway......it goes without saying....
The real trick seems to be to get real assurances that the parts suppliers have actual authorization as a sales representative. And at times the on-line resellers have been accused on occasion of being a bit less than honest in representing their true relationships.
Gotta be carefull, I guess.