Its the strongest light vehicle in the game by far. In 1v1 it completely destroys ostheer.
Simple build to follow (in top level play there is literally only one counterplay) rifle-rifle-rifle-LT-Stuart-heal-Bars-Greyhound. All in and you basically win the game, they can only survive if they have a 2nd pak
How much does it cost? 70 fuel like the Stuart I think. Well I really hope you can destroy your opponent if you invest 140 fuel while he only spend 30 on a 222. At cost of being very late on medium because once the P4 is out, you can only count on Stuart and zooks to deal with it for the time being.
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On 2vs2 depending on the map I'll prefer to spend 70 fuel on the Greyhound than 110 on a sherman to cover the flank and harass. But you need to have at least one squad of para to plant mines around.
Sometime if I still decide to go sherman first, if I lose it I'll call a greyhound for the same purpose. Cheaper and enough effective.