Oh, don't get me wrong. I really like my Rane equipments too, and they are particularly good value on used market. They are build like a brick except for the wallwarts, and DC24 in particular is full featured and very very functional.
But the ones I have do color the sound, they are a bit noisy, and they do use cheap opamps. Rane is a really cool company in that they publish schematics for their product right on their web site. You can see for yourself about the opamps.
Not all their equipments use the same opamps. Rane has a INA103 based micpre that I think is the best kept secret too.
I own a DC24 and a couple of PE15's. Objectively speaking, I wouldn't use these in my vocal recording chain. But when used for a guitar/bass sound, they are really awesome for me.
I have upgraded one of the PE15's by replacing opamps, adding bypass caps and removing DC blocking caps where measured offset was minimal. I believe Audio Upgrades people do something similar. Compared next to the unmodified PE15, the differences are now very, very obvious.
Hope this sets it straight.