Eating one right now...
THE BEST!

Couple of pointers:

1) IME the roundest ones seem to be the best for maximum edible-fruit to overall-weight ratio. The flat ones should be avoided, as they tend to have less of the good stuff. Is this even true, or just a misguided observation on my part?
2) Supposedly not good if consumed with alcohol because of its Diethyl Disulfide content.
3) Drove it back from the store in the boot. Made the whole car smell within minutes. What can you do? It's the price of admission!

In Beijing they can cost about ~RMB25 per 500gr, which works out to be about US$15 per nice sized one. (I have paid double that though, on the odd occasion!).