The SP3 dock is a real dock; the new "dock" is a port replicator and I hate such things. The older dock was magnificent in how securely it held the SP3 and how easy it was to use.
Alas, the spacers are still not in stores;I've checked with MS support on this. They are willing to ship them to me. That's a deal if I can really get them. There is no ETA on when stores might have them as per MS support and my store. We'll see if that works; I'll report back if I ever get them and how long it took. They want $6 per spacer (I need three and they want to charge me $6 shipping for each... I'm promised three boxes
).