Got to note... a buffer isn't the end all to tone suck because it can change other things.
For one, a buffer is not transparent. So gotta see how you like it...
2nd, a buffer can screw up your drive pedals, especially if its a vintage fuzz unit. You will witness velcro tones and harsh stuff happening, the moment the buffer is on.
There's also cheaper alternatives to the AXESS buffer, e.g. Doobtone microbuffer, which I have one for use when running line in, into the computer.