No-brainer compared to MIM Fender. Close, but a tick under the quality of MIA, mostly because of hardware. Finish is great, preamp is outstanding, and honestly I don't know how they manage that at the price point. For me personally, it would be more of a backup or bar/outside bass. But that's personal preference, as I'm not a jazz bass guy.
I may get another one just because. They are great, and even better at the price point. Marcus Miller would not put his name on something he couldn't get out of the box and play onstage. That was my experience too.
^^^This (mostly).
Definitely (IMO) far better than a MIM jazz. I think it DOES compare favorably to MIA Fenders but I would not take issue with someone that might rate them slightly under that; opinions, we all have them and they're all valid. I had one of my Sires mistaken for a Sadowsky by an international touring pro (for African music acts) who heard me playing mine the first time I took it out (he didn't know about Sires so I had the pleasure of introducing him to it).
Although it's all arbitrary estimation, I put the "Sire multiplication factor" at somewhere between 1.8x and 2.2x in terms of value of instruments they compare to; wouldn't go quite so far as 3x myself, but that's hardly a knock-- only worth twice what you pay. I play my new-ish used Sadowsky almost exclusively when using a 4-string J... Sire V7 is not a Sadowsky, but it's damn good, certainly worth the money. There's always the occasional QC issue, but I think every brand gets that, particularly if they do not have birk-mortar retailers to give them the last once-over before a consumer lays hands on it. Certainly for their price, I don't know of a superior bass. But-- since tastes vary, it's possible a buyer won't love it, even if it's good, just based on preferences.
It'd be nice if you could try before you buy... but, adding a middle man would add to the price, too.