I bought these tanks well used, so got a deal on them.
Yes, they are a bit taller & fatter than an AL 80, as well as heavier. But they hold 23 CF more gas.
They'd suck for shore dives if you had to walk very far, or over rough terrain. But I've used them for shore dives where the entry wasn't so difficult.
My personal experience is that I need 2lb less weight than I do with a Luxfer AL80. The bouyancy isn't that bad.
Why am I selling mine? Because after enough time searching, I lucked up on deals on used steel tanks that I like more.
Did I like them? Yes & no. I liked the extra BT. I liked the price I paid for them. I didn't like the weight so much, though my steels weigh almost as much. I also didn't like not being able to get fills when away from my home LDS.
If you have a shop that will service & fill them, mine are in hydro & both valves have been serviced within the last year or so. May or may not be in VIP, have to look. I'm asking $80 each, assuming they're in VIP. If not, I'd drop $15 off to cover the VIP at your end.