Ok, so I usually like to get out of the honeymoon phase until I wax philosophic on a new instrument. Gawd knows I've gone through enough of them over the past year or two. My reference point for "bonding" with a bass is my Rob Allen Deep 5. That instrument just speaks to me and I love it more every time I play it. I've had it for almost a year and a half and it still inspires me. I've been searching for a fretted bass (ideally a 4 and a 5) that speaks to me the say way as the RA. And the search has been extensive and expensive. But life is short and the hunt is part of the fun.
So the long story short would be various configurations of basses from Sadowsky, Roscoe, Lull, Elrick, Fender, Zon, Rob Allen, Nordstrand. I may have missed some

All great basses, but in the end I kept my pair of Rob Allens and churned through the rest. After so many years of playing and some accumulated injuries I'm picky about playability, tone, and ergos. And sadly ergos you can't really figure out until you have it in your hands for some amount of time.
Enter the YYS. I actually had found a solid fretted bass - a Fender AmDlxP that is comfy (if a tad heavy at 8.8 lbs), plays well, sounds good. But I'd been GASsing for a YY for awhile. I thought I'd talked my self out of it but when a local shop got one I decided I should go play it, hoping I wouldn't dig it. Mistake. Anywho a few pages back someone asked about a review so here are some thoughts a few weeks in after many hours and 5 gigs into the relationship.
Love the finish on the back of the neck. Absolutely sublime. Love the finish on the body, and in fact it has made it so that I don't really like the feel of the poly on my Fender (I've never been a poly fan though). At 8.3 lbs I'm happy with the weight and the balance is superb. My only ergo criticism is that I wish it had regular style Dunlop strap buttons so I could use any strap and it would also effectively extend the upper horn a bit. I find the reach to the nut while stand a bit of a stretch due to my hand issue. Seated it is perfect. As in perfect.
I was worried about playability as I tend to favor smaller frets and a bit wider nut on a 4-string. I also have played 45-105 strings so the VW set is way lighter. I figured I'd end up swapping strings. Well, I tried a set of 40-100 and didn't dig them. In fact I bought a new set of the VWs and put those on last night. For this bass and what I want to do with it I find the light strings ideal. And I'm back to gushing about the feel of the back of the neck. Makes my poor Fender feel pokey. I haven't had an issue with the larger frets. Access to the upper frets is great (and one reason I wanted this bass in the first place).
Sonically I wanted something fairly aggressive and the EMG/Pope combination covers that. I love the bridge pup with a bit of bass and mid rolled in. I also love having a "passive" style tone control that works while in active mode. I never boost treble, but there are some times I like to mellow things a bit, especially running the P pup and trying to get a bit rounder sound. One interesting note - this bass sounds great with dead strings. I've worked the original set to where they are definitely worn but the bass still sounded good. That is in contrast to other instruments where a dead set of nickels made it sound terrible. I think the electronics help with that, or maybe the Fodera strings (I usually use Dunlop or DR nickels).
The eq is interesting. Bass boost is there in spades - a little goes a long way. The mid is very nice for adding a bit of punch and bite. I generally don't touch the treble - if I want to mellow things I use the passive tone. That control also changes the feel of the notes as well.
Downsides? Sure, I can always find something to complain about. Just the strap button/upper horn thing. Other than that I don't have much to complain about. I did a quick truss rod tweak when the weather changed and have kept the action as low as possible which I've come to really appreciate.
In short, for those waiting, it is well worth the wait. For those on the fence...well, if you stay on the fence you're missing something special if you want what this bass brings to the table.