So the bass is a lot of fun - Easy to play modern bass with a ton of tonal options. Granted, I pretty much bought it for the dual parallel tones, but I can see myself using other combos in some situations as well.
The only slightly suspect thing is the wood curing. I also have a 4 string M5, and the first winter caused protruded fret end and slight unevennes of frets as well as microcracs on the fingerboard. Quick and easy fix though. But undoubtedly caused by low quality of timber used (or insufficient curing, to be more precise.)
The fretwood piece on the m7 looks of slightly nicer quality and I ordered this bass fully knowing what might happen once the humidity drops. It's a worthwhile risk as I'd recommend any inexpensive bass to go through a DIY or professional fret levelling after a while anyways. And as I'm not willing to pay that much for a modern sounding bass, this still seems like a steal to me, as the sound is just that good and versatile when you need that hi-fi'ish, fat tone.