All BCAA's taste like bunk if you ask me. No, I've never taken it alone. Most BCAA's in the UK have a 2:1:1 ratio so I buy extra leucine to make it a 4:1:1 ratio. I think that's more favourable but I could be wrong.
I still have about 4 months worth of BCAA's left but when I'm done I'll try the leucine alone.
What specifically have you noticed different?