Can't say I've heard all of those. Have definitely worked a lot with the XXX's. Have worked a lot with the W7's also, used to sell them.
I have a soft spot for JL products because they have been making such **** good products consistently for like 15 years. They have won awards, patented new technologies, and put more R&D into their products than any other car audio company I can think of.
After meeting Manville and the crew and getting the full tour, and extensively demoing all JL equipment, I must say I love what they do.
So it's expensive, so what? You get what you pay for.