If you like the "Flight" in Flight Simulation than the Su-25 is for you, whether you buy it with Lockon FC3 or separate.
It is really nice to fly, crisp, fast, you really "feel" the aircraft. And less sluggish than the Su-25T.
But it's not an anti-tank weapon: the Su-25 is for very classical ground attack and closer-than-you-like air support, with dumb bombs and rockets, or with the rudimentary Kh-25ML laser-guided missile.
Super fun if you ask me.