A few years back I really got tired of the cotton underwear so I bought some under-armour brand polyester briefs at $19.99 and loved them from the start.  Keeps you cool and dry in the summer.  Found some Rebook brand that I really like that Dick's was closing out and were about $12 a pair.  Was looking for a few more pairs and didn't want to drop $20 a pair so I thought these looked good.

Pros:
 - Cool like the Under-Armour brand
 - Elastic band is nice, seams are good too
 - Price is great

Cons:
 - They seem a bit short in the back.  Not sure if I have the right butt for them but they seem to be a bit lower in the waist band in back.  Feel like a plummer once in a while when I bend over.

I like them so far, I always line dry my polyester briefs so hopefully they'll last as long as the other Rebook and Under-Armour brands.