Any problems with Microsoft Online Store?

I am about to purchase something from the Microsoft online store but I have been reading reviews about how many people have had shipping problems with them. The problem is, the sites that I went to to find the reviews seemed to be biased to only receive negative reviews (I mean why else would you review a store unless you had a bad experience with them). So I was just wondering how you guys’ experiences with the Microsoft store have gone. Negative or positive reviews are welcome, I just want to know if the negative experience is the minority or the majority.

Some of the sites I went to (after googling “microsoft online store review”):
Reseller Ratings
Pissed Consumer (if “pissed consumer” doesnt scream intense negative bias, i dont know what does)
Pissed Consumer Compare to Apple and Amazon
Site Jabber
Consumer Affairs

Thanks

tl;dr: What are your experience with the online Microsoft Store?