@desalvo55 Legacy makes some of the best speakers considering performance to the dollar. The XD offerings are a great way of enabling the speakers to work well with tube amplification. I am now an official installer/reseller of Legacy products, but prior to that I owned both the Focus SE and Aeris. I moved onto the Aeris to take advantage of the powered bass section and used Cary 805 Anniversary Edition mono blocks for the mids and highs. The performance was excellent.
One thing I’ve found, and this is personal preference, is that I’d rather land on a slightly smaller Legacy AND integrate a pair of subs vs try to get a much bigger speaker in their lineup unless the room really calls for it. Even with the Aeris, which goes down to 18Hz at -2dB, was placed many feet from the front wall and as a result did not charge the room in the same way that later on a pair of Signature SE did with a pair of SVS SB4000 did. I now have a custom pair of the Signature SE coming for my floor as, paired with the subs, it is more than enough to fill my medium/large room.
The XD would still be beneficial for any system that uses tube-driven amplification as it will provide more grip, speed and control in the audible bass and will result in a cleaner image throughout the frequency spectrum. But keep in mind it may not negate the value subs can play in the room with regards to sub-bass frequencies, cleaning up room modes, and widening/deepening the soundstage as a result.
Feel free to PM me to chat, or happy to keep it on this thread.