Improvisational skills second to none. If you're looking for more structurally complex songs get Erotic Cakes and any of his work with The Aristocrats. Check out his Late Night Sessions 1, 2, & 3 - phenomenal.
This was my first exposure to GG. I had heard about him from other players and decided to check him out. The sample snippets were encouraging and I bought the album. He is a phenomenal guitarist and he can cover many genres with ease and taste. The jazzy parts are superb and he can hold his own with shredding as well.
GG is awesome! I purchased this over at jamtrackcentral and was happy to see a little more main stream exposure for Guthrie. The songs are great and his solos are better than words! This is a must have in my playlist for longs runs!