This has been a long time coming, and I'll have more to say as I spend more time with my current system. That said, the short answer is yes, I like the combination of the Spectron Musician III Signature Edition and the SP Technology Timepiece 3.0s
very much.
The 3.0s just arrived yesterday, and though they have less than 24 hours on them, I was surprised at how clearly improved they are over the 2.1s. I knew they'd be better, but I anticipated the improvements being more subtle. Fortunately, that isn't the case.

Now I know why all the Mini owners have been so crazy about the sound they're getting. 90% of what I'm getting for the price of a pair of Minis just isn't fair,
regardless of the wait time.
If initial indications are to be believed, the "like...
very much" may soon become something like "outrageously good", but time will tell. In the meantime, I can only say the Spectron has been a suitable replacement for the Butler Audio Monads. That'll mean something to some and nothing to others, but IMHO it's a glowing endorsement.