They're not too good, Furgle....
The trigger's are crap, the build quality's poor (Spanish built by Gamo..), the scope rail's an odd size, they twang and rattle badly, high recoil, the moderator BSA fit hardly makes any difference, bits come lose all the time 'cos of the vibes, they're not really what anyone could call a quality product....
Have a look at the HW99 and 95, they knock the Gamo, er, I mean Lightning into a cocked hat on all counts.
Cheers