No problem!
I just got X-Wing for Xmas and I've played on both mats. Obviously it's not like playing on felt but the resistance felt reasonable and unlike the wooden boards at my local games club where I encountered the problem you describe, there were no issues with minis or the card measuring templates slipping.
The only time I had slippage issues was when playing Epic I put some books under the mat to create hills, it did create some slippage issues for infantry stands but I would expect that.
I'll try to measure the exact size of the border for you tomorrow.
Strangely enough, my snow one had no border but the desert one did. I don't know why this was the case. The one thing I would criticise is the seller's communication, the responses were often overly brief which is frustrating when you are paying out a reasonable amount of cash.
I'll ask other forum member Craig to comment on this thread also as I think he has seen both mats in action and played me at X-Wing on the desert mat yesterday.