I have 6 500 series modules, 4 eq's, 1 preamp and a compressor. I also have full rack gear, eq's comp's and pre's and I'm not finding any noticeable difference. I think the biggest reason they cost less is because there is no power supply, i don't think it's a lack of quality components. I have two Radial Workhorse power supplies that IMO are a great product. One is a 19" rack mount and one a Cube you can take anywhere. Both are 3 bay. I think they are more for taking your gear with you to other studios or other places you record. I bought the cube so I can go to my friends studio and use gear he doesn't have and visa versa. I think it's more a portable thing.