There's nothing wrong with the AR TSW series. Great speakers, from the models I've heard; TSW 210's daily at work, and 410's that I used to own.
The main deterrent, concerning the TSW's, is their voicing. Most long time Acoustic Research fans love the original AR laid-back, rolled-off treble balance. Non-fatiguing and easy on the ears. Easy to listen to, all day, a more natural balance. Which is nice, if you like a rolled-off balance? I don't. And the TSW's didn't sound rolled-off either, compared to the Classic AR's. So, they weren't well liked when released.
As to favorite vintage sealed boxes, again AR. My AR90's and my newly acquired AR58s speakers. Both well balanced, not rolled-off. Great bass and imaging. Easy to place. My new AR58s speakers are awesome so far, a 12" 3-way, with the 12" woofer, 1.5" dome mid, and a 3/4" tweeter. Very dynamic speaker. Maybe more so than my 90's. Usually cheap too, as most AR Fan's are looking for AR-3's and AR-3a's, and paying $1000 more than I paid for my 58s's, when they're basically the same speaker. Though the 58's do have that more modern voicing. Any of AR "Vertical Series"would be great to own. AR9, AR90, AR91, AR92, and the AR58s all share the same dome mids and tweeters. Except the AR92 has a 10" woofer. And I guess the 58's and 92's could qualify as bookshelves? They do to me!