I've skated in just about every brand of holder/ steel there is and the t-blades were by far the best. I actually took them off recently though due to lack of availability of replacement blades. I went back to the LS2's and my skating has suffered a bit.
Pros:
Glide- the way they cut the steel makes them glide way better than standard steel to the point that you almost have to relearn your stride. took me about an hour to get my form back.
Agility- Unlike your standard steel holder combo, the blade actually flexes when turning keeping the actual blade somewhat perpendicular to the ice. Extreme sharp turns are very easy with them> This is the area where I miss my t-blades the most.
Consistency/ Replacement- Every set of blades you get are the same. They are extremely easy to change. Especially if you put the screw heads on the inside of your skate. I've literally changed blades in between shifts. There are several different rockers and hollows available. I used to carry 3 different hollows with me, after warm ups I could change my blades for different ice conditions.
Sound- They are a bit louder. However, I find this to be an advantage. Players think your closer, therefor rush the play IMO.
Cons:
Durability- The actual blade is fine and they last forever but the holder itself isn't very strong. They tend to crack around the base on the inside of the heel. Myself and a teammate went trough 4 right foot holders in one season. Maybe try the carbon's???
Looks- You will get chirped at so be prepared.
Availability- Gotta buy in bulk, run out at the wrong time and you might find yourself in some trouble.
Sorry for the long review, but I really did enjoy the advantages with the T-blade system and feel they get a bad rap. Due to my local supplier closing and sick of ordering online, I kinda gave up on them. I will say though that I lost an average of .2 seconds on a full lap time just from switching to the LS2's and defiantly loose that occasional edge just a little bit more.......
BTW: YOU CAN NOT SHARPEN THESE. THE STEEL IS ONLY ABOUT AN 1/8 INCH THICK. WARPS THEM ALL TO HELL...I TRIED.