I made this purchase to upgrade from my very old HeadBlade razor to the updated version. I honestly love the looks of the new razor, but it's performance is not up to the standards of my old version....this new MOTO razor was sent to me with the HB4 cartridge, and set up to pull/blades cutting towards the rollerball....I tried it and immediately was not happy..it failed to cut 70% of the hair with one stroke...I had to go over the same pass more than 6 times before I was satisfied. So after a very long shaving time, I compared it to my old HeadBlade razor and saw the difference....the new razors blade angle is steeper, and closer to the finger hole...and the finger hole is way to small for my finger, and I had to force my finger into the hole, which makes it to tight and doesn't allow the razor to float smoothly. My old razor accepts the new cartridges and cartridge mounts, and is set up to push the razor , not pull....which has always worked better for me. This is totally my opinion, the experience is probably different for many others....but for me, my old razor shaves circles around the new MOTO Razor......I will still purchase the HB4 & HB6 cartridges for my old HeadBlade razor.. and you can see in the picture how much larger the finger hole is, allowing my razor to float freely over my scalp