It's a nice deal.
I got the session versions free with Korg Nanokey 2 which was going for about £25 at the time; All the Sessions also come with the other Nano products in that Korg range (but prospective buyers should check this is still the case).
Then I upgraded to the full versions in their half price sale (look out for the upgrading prices, not just half price sale prices).
Lounge Lizard and VA2 are the cream of the crop but the full package is still worth upgrading to.
I can also recommend the Pianoteq "Electric Pianos" pack, if you have full Pianoteq. I have both but Lounge Lizard is the most flexible.
Look forward to the next version of Lounge. Also hoping they will provide scaling GUIs like other leading companies such as U-HE and IL.