First of all, I rate it medium action, but all of my other rods are medium fast to fast action, so that may be a relative term.
I have two rods I have built to compare it to, a 4wt Custom Series Pac Bay and a 4wt Batson RX-7+. While both blanks run about $200+, I was able to get them for less than half price. If you cast them side by side with the Tiger Eye, you can really tell the difference. Both are more powerful, but they are 9 foot rods. Both have a smoother cast, are more responsive to load and a lighter feel in the hand. This is not to say that the Tiger Eye doesn't outperform its cost, it definately does. It's just that some of the "higher end" rods are worth the extra price.