Put the money toward a new amp instead.
2006 Lexus RX330
Crutchfield Customer Review (What's this?)
I experienced three of the same issues that factor into all the other negative reviews here and elsewhere, the worst two being  No working Fader control and  inconsistent volume from day to day. I might have tried a replacement unit, but it seemed like a pretty flukey piece of hardware to begin with. And, unfortunately, due to the holidays and some family medical situations, it took me a month past my return window to get everything in place, test it, and realize this thing just wasn't going to work. I'm glad it only cost me this much, but that's money that would have been much better put toward the new amp that I eventually had to install anyway. Ultimately I'll keep one of its wiring harnesses for convenience, but the TYTO-01 unit itself is going in the trash. This was in a 2006 Lexus RX330 (non-Mark Levinson, with Navigation), with a Pioneer MVH-2400NEX replacing the stock head unit.
Pros: Edcuated me that (1) speaker level audio is a poor way to go vs. Live Level and (2) the original, stock Lexus (Pioneer) amp was poor to begin with. Includes a conveninent wiring harness
Cons: No Fader control Inconsistent volume from day to day That "convenient wiring harness" ended up costing me this much Installation/connection instructions are laughably bad. I was only to make sense of it all after watching an extensive user video on YouTube