That above ^^^ maxrpm ie. most sound shite when idling but then like any other petrol when on the move...except for some of the newer ones, especially Mazdas new skyactivD which totally sounds like a petrol engine - maybe grab one of those S/H down the track
Your right !!! was never a fan myself until recently looking into alot of vids of the later oilers out there, some of the tuned and modded ones actually sound pretty impressive...
Now that power (kw) output and performance figures are finally starting to look competitive compared with their petrol counterparts (torque output and efficincy were never a problem) I can see myself becoming an oiler convert - well for my next daily driver anyway