First I need more playing time and find the (for me) sonic sweet spot before I can tell something serious about the sound. I'm familiar with the preamp but not in combination with this type of dual coils.
I can tell a few things about the build quality: Both stacked pots needed a different washer inside the control cavity because the ones that were stock were too big and the pots worked themselves loose almost immediately due to that.
There were some sharp-ish fret ends (for me as a builder, someone else might probably not notice this), these fret ends however were nothing that couldn't be solved by some fret-rolling with the side of a screwdriver.
It's a pity the first one they shipped me had a worn out truss rod, the above mentioned build niggles ware also there on this first one.
Setup out of the box was very good, there was no need to tweak the truss rod but given issues with the truss rod on the previous bass I got I tried this anyway.
This one is a little bit heavier than the previous one but stil relatively light in weight. The paint/polish job is very good, no blemishes or strange spots anywhere, the accent line around the body (no blue clear paint) gives this bass some extra visual class, amazing they can do these sort of things in this price range.
The Sire M2 five string series are 35" scale by the way (checked this myself after someone on TalkBass mentioned this), everywhere it is advertised as being 34"!! I like 35", used this scale on most of my DIY builds
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