I'm also quite impressed with support. to date I have replaced
* Surface Pro 2 twice (under warranty)
* Surface Pro 3 twice (under warranty)
* original Type Cover (under warranty), got a Type Cover 2
* Power Cover (under warranty, this one just arrived today)
* Surface 2 twice (accidental damage)
Every single time they have been quick and courteous, whether in-store or via mail.
Of course one might question why so many items needed to get replaced, but that's a different story...