No i am using the new units they are very poor.
What conditions particularly? Which setups are you using vs what?
Harpoon + 7 Rogues is expected to be strong vs most armies, but you may need to hold back the harpoon sometimes. At low to medium attrition 2 harpoon + 6 rogues should skirt the issue mostly and allow for an ok full auto.
8 Glider should work well enough for a full auto - especially against SAJM artillery. But probably not enough of an advantage to clobber SAV artillery better than the SAV flyer since you lose your AO contribution. Which matters more than the relatively small stat boost it gained. It also may fear harpoons at medium to high attrition.
In general:
The heavy & fast got minor stat upgrades but are otherwise identical. You'll be best off using the like-age unit against the target to benefit from AO.
The light unit got its range nerfed it appears, but is otherwise very similar to the light unit in SAV - so I guess it's even harder to use.
The artillery got nerfed (blast instead of power shot) which indirectly buffs flyers.
The ranged unit gained contact! and should be a key feature in fights in SAJ - especially when combined with rogues for free retaliations.
I really need to get my beta world aged up in the next year