I've used the 410HLF with a Markbass LMIII, Peavey
VB-2, and an Ampeg V4, sounds very good with each amp. I would describe the sound as clear, more transparent and lower than the 810, yet the 810 is tighter in the mids with it being a sealed enclosure. You'd think me saying that the HLF is transparent would mean it's tighter sounding than the 810, it's not but you can definately still hear every note clearly. The HLF goes much lower than any sealed cab ever would, and in my reggae band it really sounds excellent IMO. On the other hand, I use an old sealed V4 4x12 loaded with basslites, and I think it sounds awesome in its own respect because it does the sealed thing and is punchy as hell. My tastes change so I like to have both cabs on hand for my mood. If I were to sell one I know I'd be regretting later b/c they both shine in their own way/category of sounds. One can do better at what the other can't, so that means keep both!