My head is kind of big so your comfort mileage may vary. They're not too bad for the price. I'll use them till they don't work anymore but when I rebuy I'll go for something a little better.
Cheap; I bought 3, mic seems to work pretty good on all three; No one on the other end ever reports difficulty hearing me; Comfortable enough to wear for a half hour
I have difficulty hearing with all three; The speakers in the headphones are not very good; Also the input volume and output volume seem to share the same dial and can only be adjusted separately on your PC; Kinda makes the dial not so useful; Not comfortable enough to wear for an hour.