I have used the Hardy preamps many times. I would not call them "transparent" since they aren't really a staright wire sound (ala martech, certain Millenia, Buzz, Earthworks etc...). I certainly would consider them "clean" though. They definately do have a sound that belongs to them. I would say a little cleaner than an Avalon 2022, more "honest" (for good or for bad). They certainly aren't a bad preamp to have around. What I noticed though is that they just aren't my favorite preamp, probably for the same reason a lot of people love them though, so it really is just an opinion. I guess I am just a preamp junky, but they just don't seem to have that "magic" sound that so many other preamps have that I love. For me they just don't help you out in any real way. With a good mic and a good source they sound very honest though with a touch of flattery. Not too aggressive, but not too invisible either. I guess I just like the "big" sound. Api, Chandler, Neve, Daking etc... That is just sort of my stlye though. I can also easily see how so many other people do like them.