I have a couple of Liogier rasps of various profile, length and grain (from 3 to 15), and an Auriou 11 cabinetmakers. Fir some reason, I find the Auriou ever so slightly quicker in action, and also more controllable with finish. However, that might just be because it is the largest rasp I have. Both makes I find excellent to use, and a lot more controllable with regards the finish - a light touch brings a much smoother finish independent of grain. I am not convinced that extra cost of the Auriou is justified over the Liogier, mind you. Plus, Noel is a pleasure to communicate with.
I am quite keen to see how the Italian startup mentioned on another thread prices itself.
I also have a £2 rasp from a 2nd hand tool shop, like a float but with curved 'teeth' (a dreadnought?), which is fantastic for hogging, leaving a considerably smoother than expected finish. I use it a lot on guitar necks (well, the three I have made so far, anyway!).
Cheers,
Adam