When I used the Head Blade I used the Sensor Excel cartridges.I tried the Sensor 3 cartridges and they didn't shave any better and were pricer so there was no reason to use them over the 2 blades Sensor cartridges.
THier,I use the razor on my headblade, not the disposable ones. I would think the disposable won't allow the blade to move a freely as the headblade does, just a thought.I actually recently bought headblade triples for my headblade and don't seem to get as good of a shave as the S3's were giving me. Also seems the S3's last longer but it could be a mind thing.Never had a nick issue with the S3's though.