The Scarpa Thunder has been replaced by the Helix - Women's. While still a similar shoe, it has seen a few design changes.
Overall, the Scarpa Thunder women's climbing shoe stands out for being comfortable, fitting snugly, and having a very well made upper. I know quite a few people who have these shoes and love them. They are not very expensive for a high quality shoe, which makes them very appealing. If you like a very precise toe, then this shoe is not for you, you should try the La Sportiva Katana - Women's or La Sportiva Miura - Women's, but if you like a little extra edge on your shoes, then the Thunder is great. If you like the 5.10 Siren, this shoe is very comparable, but less expensive.
View our complete Women's Climbing Shoe Review to see how this product compared to others.