I owned Jeff Rowland Capri preamp and was rather happy with it. However, when I got Joule-Electra LA-300 preamp I learned what "sonic paradise" is all about.... No comparison between two. These both preaamps are similar to that you asked.
I think it comes down to comparing tube to solid state. I do not own the Jeff Roland but have heard it. I own the Joule Electra LAP 150 MKII(soon to be Signature) and would not give it up.
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