What you have to remember with Saleae, is that they had an original line-up, the Logic 8 and the Logic 16 (these are the ones that are cloned on ebay). They were digital-only, in over-engineered milled cases (Dave has a review of them somewhere), now discontinued but still supported. Then there are the more recent products, like the Logic8 which have analog capability. Their product history naming convention is confusing [Edit - as you're finding].
The original Logic 8 was no more than a clone of the Cypress EZ-USB FX2 eval board itself, in fancy case. In the Logic 16 is where they learned to put an FPGA in for higher performance / flexibility. It's only the more recent products that they got more inventive with their hardware. The user-friendly software was their original USP - hence it's a bit naughty to use it with clones (even though they are no longer competing with their current product range).