Hi, I just ordered one from newegg.com. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
They're on sale now about $60 off for a total of only $90 bucks. With this sale price (not the normal retail price of about $150), the per gigabyte is about twice as much as a traditional HDD, but the performance, from what I understand, is much better. The one I linked to can beat some pure SSDs in write speeds, but usually isn't as fast.
However, even though it isn't as fast it's much better than a traditional HDD from what I've read. At the retail price of $150, you could buy a SSD that only has 1/8 the storage compacity. And the one I linked you is more than 33% off, so it's that much of a better deal.
Basically a hybrid drive gives you way more storage and comparable performance to an SSD for the same price. It won't be as fast as possible, but you pay hundreds of dollars less.
If you are talking about the WEI (windows experience index), that is totally useless. I think tools like HDTune give better results and even then, your real world experience should dictate whether the drive is good enough for you.