The Frenzy was designed to be a comfortable all-day shoe with excellent edging performance. I've used these shoes bouldering, on overhanging sport, precise edging sport, crack climbing, and alpine rock, and I'm very happy with them, with one exception.
Comfort - This is the most comfortable rock climbing shoe I have ever used. It fits my foot like a neoprene glove. The tongue design is really great. This shoe is very precise but without sacrificing an all day fit like with the Anasazis. The heel cup really holds your foot in there nicely.
Price - A fantastic value at $79!
Edging - This shoe edges on a dime. It is amazing. I think it is actually better at this than the shoe that is known for edging: The 5.10 Anasazi. Extreme edging and comfort in one package. Wow!
Hooking - This shoe has sticky rubber extended over the toe box to help on overhanging sport. This shoe hooks pretty well, though not as good as specifically designed bouldering slippers.
Smearing - This shoe is not the best smearer. The toe box is fairly stiff. It does a good job, but is slightly less effective than a 5.10 shoe like the Anasazi or Spire.
Crack Climbing - With the stiff, narrow profile toe box, this shoe jambs really well. It is the best crack climbing shoe I've tried.
If you are looking to do a lot of slab climbing, or very overhanging sport, or bouldering, look elsewhere. However, if you are looking for a comfortable top notch edging and crack climbing shoe for the crags and mountains, I would highly recommend the Mad Rock Frenzy.
I agree with Martin. The pair I got actually hurt my feet for the first 2 days. After that they fit like a dream! The pointed toe shape is perfect for cracks. The shoe edges like a dream. For 70 bucks this is great value for a great shoe. Only problem I have encountered was the neoprene tong riding to the side every now and then.