The Sam's warranty is almost a no questions asked warranty, in other words you are COVERED if something fails. Many SMF members who bought their MES thru Sams also bought the warranty and over a 6 year period I have heard nothing but good.
I also bought my MES 40 6 years ago from Sam's and at the time they had a 1 year warranty for $15, you might check that out, the MES factory warranty I believe is 90 days. The sams warranty is a good reason to buy from Sams although some new owners have reported they had a initial problem with their MES and returned them to Sam's no problem with the return/exchange and were happy with both Sams service and the replacement MES.
My purchase of the MES is what prompted me to join Sams, we already were members and still are of Costco. I have kept the membership at Sams active, I think I buy just enough and save just enough to warrant the membership fee. If you buy groceries at Costco, their packaging/quantity often forces you to buy way more than you need, however the price justifies it. Our local Sams has started offering similar products in smaller quantity packaging, and still passes on significant savings, so I really appreciate that.
BTW it is common knowledge that ALL Sams do NOT stock the MES. For years it was only a midwest & east coast item, they finally have them in one Sam's here in Sacramento. I had to order mine Online and pay shipping but even then it was only $299, so still a great deal at the time.