My experience of them is very limited, but every exposure leaves me with a very bad taste in my mouth. Incredibly sketchy characters who seem to start at 10x used car salesman as a baseline.
For decades there has been grey market for buying cameras from the big stores in NYC. Basically they are the exact same stuff but without warranty protection in the US. The weird part is how today these are just options on the web site not a shady guy in the store offering it.