I have been attending an English descriptive grammar classes, which is pretty much about morphology, phonetics and phonology. If the Russian classes are going to be anything like that, I can tell you, from my experience, you might find it incredibly boring. I mean, it does have some interesting aspects, but most of the time it's studying about useless things, that you in no way are ever going to use in practice. At least that's how I, and 98% of my peeps, feel about it. I already shiver at the thought of me having to take Russian descriptive grammar in two years time.