never really heard anything good about the 511/811's
How long have you been on this forum? Of literally hundreds, they're 2 of the best sounding small format exponential horns ever made.

P.S. An alternative approach would be to sell the large format horns and drivers and replace them with 802/511B combos and put the remaining cash toward the woofers. Still a very good system and may be better for smaller rooms.

Others may like to comment on this post.
I agree about the room size and small format components. However, the large format multicells are the only reason for the OP to make this purchase. The lot is priced at the very low end FMV of the horns. Buying them to sell them would make no sense at all to me as it would be a LOT of work to net very little if any profit above the initial cost of the horns.

The VOT cabinets may or may not be the genuine article, and they're painted white. Their value is negligible in terms of resale. Combined with the horns and drivers however, they are a big step at a very very fair price toward an A5(515 woofer) VOT system, or large format A7(416 woofer)

Just my .02 of course.......................