I did a fair bit of research before I ordered the Sire.
A few days before ordering it I took a trip to several guitar shops specifically to check out the Squiers and Fenders available. The Squiers were good, however, the VM I saw in one shop, the finish although not bad wasn't very impressive...and I was comparing that to my Ibanez SR300 and Yamaha TRBX. The Squier was ok. There was a very nice Mexican Fender Jazz in another shop, however, I couldn't see why it was over £200 more than the Squier.
I was very happy when I received the Sire that I hadn't bought any of the basses I'd seen in the stores a few days previous. It's a marked step up. As for the length, I think this is only a problem for some gigbags, it fits perfectly in my hard case. It was intended to be shipped with its own gigbag but it was Thomann's decision not to supply it with one ( I seem to remember it making the increased price unattractive for a new kid on the block). I personally don't think the holes for the through stringing are in the wrong place. Looking at the 5 and 4 string bridges it seems to me that the saddles are much deeper on the 4, even then through body stringing is tight but not impossible.
The headstock didn't do much for me initially, but then if you look at some premium Fender clones their headstocks are a bit meh! as well.
Overall, this bass is a winner for me. At this price it really must make other manufacturers sit up. Either Sire make a loss on each one or others are making massive margins