Ha ha. They don't call it "rolling" for nothing.
But no doubt your MJ-4 is going to be incredible. I hope you post pix/clips when it arrives.
I got a hold of my V7 on Wednesday. I've been working like a maniac this week so I haven't spent much time with it yet, but I will share initial impressions. As I suspected it's a Chinese version, and it came without a gig bag--for me at least those were perfectly reasonable trades for cutting $100 off the price and 2 months off the wait time.
The control plate and pick guard don't line up. The side of the pick guard that meets the control plate is too small, and is offset from the edge of the plate by a millimeter or two on each side. But that's the only defect that I could detect. The knobs are mounted high off the control plate so there's a gap underneath them of maybe 4-5mm, but that's an easy fix.
The setup is good. Nut slots and neck relief are textbook. Intonation is right on. I did not measure the string height but it feels fine. The pre-amp is transparent and dead quiet. Mine came set to zero gain, so I can't tell it's on unless I adjust the EQ.
I don't play jazz basses or even round wound strings at all, but even with my crappy technique I can tell that the A, D, and G strings have the potential to sound like the videos posted here. It's nice. The E string seems dead, but in a weird way like it's empty down low but still plenty of presence up high. Maybe I'm just too accustomed to humbuckers and P's. Maybe the string is a dud.
That's about all I'm qualified to say. I can't really compare it to other jazz basses or to higher end basses because I've never owned any. But it's certainly a nice addition to my collection of budget Asian instruments