It's a big thing.
Even for Russia, that trial was a total farce - a show trial in the best Soviet tradition. I expect plenty of demonstrations, but they'll have limited impact.
Public opinion here is pretty evenly split into 3 parts - those who think what they did was wrong and they should rot in jail, those who think what they did was wrong but not worth a jail term, and those that think they didn't do anything bad.
I'm not sure all of the vocal support from around the world has helped. Putin's the kind of guy to dig in his heels before bowing to pressure.
The 2 year sentences the girls received is a lot better than the 7 they could have gotten, but still unbelievably stiff for something that in most countries in the West would be considered nothing more than misdemeanor trespassing