Congrats, Bob! I think you're gonna like your new babies!
I have a friend with fifteen year old Sound Labs (I've never actually heard his pair). He has never had a thing done to them - no upgrades, nothing. He's a much more mature human being than I am - me, I'd be wanting the latest & greatest. He is quite familiar with the latest advances - he used to work for Sound Lab, and he helps Roger West every year at the CES. Roger would update his speakers free - they are best of friends - but the man isn't interested. I have heard of even older pairs still in use. My point is, Sound Labs can last a long time, and even older models continue to sing.
For the benefit of anyone not familiar, Roger West of Sound Lab (formerly of Janszen - remember them?) designed the A-1 ("Audiophile"-1) about 20 years ago. The same basic design is still in production today - a large faceted-curve panel that radiates over a 90 degree arc. There have been incremental improvements over the years, but the basic design is the same - it wasn't Roger's first try, but when he designed the A-1 he really got it right. The M-1 ("Millennium"-1) is a relatively new development - it's essentially an A-1 with less wood trim, and a bit lower price. The U-1 ("Ultimate"-1) is an A-1 with an ultra-rigid tubular metal frame, and a higher price. For the traditionalist, the A-1 itself is still in production.
One nice thing about the Sound Labs, as Bob discovered, is that Roger West does his very best to design improvements that can be retro-fitted to older speakers, so that customers haven't just spent a pile of money on a speaker that in a couple of years will be obsolete. To put it in Maggie terms, it would be like being able to bring a 3.5 up to 3.6 standard.