Strengths: Very accurate center frequencies, tested with an AC RTA. Ok, so I paid $20.00 for it. The previous owner swore it "produced engine noise"...I knew it wasn't the EQ's fault so I gladly paid the $20. hehe
Weaknesses: Uhm.......well, if I were to nitpick I'd say I didn't like the gaps at the upper midrange around 4,8,16kHz. True, it is an octave EQ up there...but the flexibility is missed when there isn't adjustability. Also, it's not Constant-Q like the EQT, but it's not supposed to be, especially being (again) an octave EQ.
Summary: The Automotive equivalent to Pro Audio gear (not Clarion...pro audio concert stuff, ya know). The build quality is there and the sound quality is better. I really like the input level LEDs, they really show which headunits actually produce the output voltage they claim. As a side note: almost none of the units I tested could make the 4 volt LED flash at max volume, using a 0 dB (max recording level) test CD. Alpine, Clarion, Kenwood, Eclipse....hahaha (ahem)