I would like say that SYRIZA has kinda confusing ideas and their people have no actual communication. SY.RI.ZA has SY from συνασπισμός(synaspismos) which means coalition. The members of each party that form this coalition has a different opinion and practically cancels everything that the others say.
At the same time KKE (Communist Party of Greece) has highlighted that SYRIZA wants to become just like PASOK (this party is the one that ruined our country with New Democracy). They want to have the label of "socialists" with revolutionary ideas but they
are just a bunch of wooses that don't want to take drastic measures. They just want to take over the power and get money from the big companys so they can sell out even more Greece and Greek people.
The fact that they suggested the union of the left and nobody (and when I say nobody I mean nobody) accepted the invitation means something...
Anyway I don't think SYRIZA is a serious party that can bring the revolution or fight capitalism for the rights of the workers. Don't think much of them.