RE: Rhino 4900
I like Rhinos the best, over Zippy and Blue. They have lasted a long time, still perform very well, and have stayed hard and cool.
Looks like the stock at Hobby King is dwindling. I'd LOVE a set (or few) of 4000mah rhinos.
On a slightly different topic, I just got a set of 4000mah packs; they are 10oz/280 grams lighter than the same 5000mah packs.