About the same pen as the 100mm on the T44 then, at least being an American tank you'll have some gun depressionThe T95E2 is an interesting tank, however I do rate the 59-Patton higher as it both gets the premium tank credit bonus (which the T95E2 doesn't) and higher pen with it's standard AP rounds (190mm vs 181mm). I really think they should buff the gun to 192mm penetration and give it the credit co-efficient, but it is still not a bad tank as it stands.

Comparing tanks on tanks.gg it actually looks a very similar to the Centurion I, ignoring the pen difference the gun handling stats are quite similar, you just get better DPM, a slight loss of accuracy and less shell velocity. With a bit more hull armour, slightly less turret armour and a healthy speed boost on paper it doesn't look too bad.
I know it doesn't get any credit bonus but the AP shell cost is only 255 credits which is a kind of indirect credit bonus. Does it get any experience modifiers?