Well, the XL series has several models... the 1x15" (not suitable as a standalone, at least for me). The 210XL (2x10" without tweeter and sealed... I like it). The 2.5XL (2x10" with a 5" mid-tweeter, bigger than the 210 and reflex), the 410XL (same as the 210 but with 4 speakers and reflex, if I remember correctly), the 4.5XL (4x10" + 5").
The cabs are made with plywood (pretty heavy too), the aluminum cones sound good to me but they can crap out. I've always had poor luck with them but there are peoples who never ruined one so... I guess it's a matter of luck?
Some times the aluminum comes loose from the suspension... in those cases you only need to glue them back together.
My personal thought: if you really like the sound and can try before you buy, go for it. Otherwise save yourself a huge loss of time, money and patience and look elsewhere, they're pretty old products and not really easy to carry around in their 4x configurations. But I liked the 2x10"s, both of them, when I tried them. Shame every time I bought one used it arrived with broken speakers.