I've gotta say, I'm extremely disappointed.

Fit- I swap these out with my 812's and Ariakes and V2's a bit. However, a few months ago it rained for two weeks straight and these were the only shoes I wore so I got a feel for them. They're comfortable, yes. But they just seem kind of off in a way to me that you can really only notice when making a shoe preform at its best. 3/5
Flexibility- Eh. It's flexible ok upward, but the sole is pretty thick making it hard to bend downward. 2.5/5
Weight- A little bulky because of the sole, but overall not terrible. 4/5
Grip- Oh my God do I hate this grip. Concrete, awful. Brick when not painted, awful. Painted objects except for brick, awful. It slides on everything everywhere when it's wet. The only thing they seem to have grip on is painted brick and mirrors. Nothing else. I try walls runs or cats, I slip off the wall or ledge. I try to land on something in the wet, I slide like 15 feet after landing. It takes me every ounce of strength in my body to keep myself hanging on a wall for more then 20 seconds. Because if I put my shoes on it and put any weight on them, they just slip off. These shoes are supposed to be made for parkour, hence the PK in the title of the shoe, but it seems to me that Inov-8 just wanted to capitalize on the market without much effort. 1-2/5
Breathability- They're lined with Gor-tex, which makes them absolutely freaking waterproof but I've ran in them and never had hot feet. Breathable and waterproof. 5/5
Cushioning- Fairly good cushioning all around. I think it has a nice balance of it that is well distributed around the shoe but it doesn't feel barefoot at all. There is always room for improvement. 4/5
Durability- I've had them for three months now and I don't wear them everyday due to changing out shoes, the shoe it self is fine but the sole is starting to go. 3/5
Price- 100 bucks. Pricey and not worth it. 2/5
Comments- I can bitch all day, but I'll just leave this by saying that I might buy a different model of their pk line of shoes just to test it out, but I will never buy the 305's again.
Pro's- Great breathability, ok flexibility, and good cushioning. Good weight and they're waterproof.
Cons- Grip. Period.