There are a number of games in our database here on this line ... not many, but a few. Black's move here is typically 5. ... dxc3, and there is an interesting game by Nigel Short in 2006 where he wins with White versus this.
There really are not many decent alternatives for Black at move 5. One might be 5. ... Nbd7!?, when the game might continue with 6.exf6 Ne5! 7.Qe2 Nxc4 8.fxg7 Bxg7 9.Qxc4 dxc3 10.dxc3 (F8), which looks roughly even (Black is a pawn down, but has the two Bs).
Any other move by Black looks weak (e.g., 5. ... e6, 5. ... Bg4, or 5. ... g6).
I really don't know this opening, but it would seem to be playable.
A friend of mine typically plays the caro against me, and i usually get trounced. Recently, i watched an Andrew Martin dvd, and he recommends the Goldman Variation. I've tried using this twice, and the beatings are even worse :) I just wondered if anyone had experience in this line...note the annotations