Does anyone have info on roller skiing?

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I have cross country skied on snow just a few times and I love it - i am hoping to do quite a bit more this winter. But when I went to the mountains this summer, I saw a lot of people roller-skiing. I would like to try it but am nervous because:

1) i SUCK at rollerblading (bought a pair, used them 3 times, then donated them to good will because I lack the balance to stay on them

2) I am not able to rent a pair to try it and am worried about spending $400 on something i don't know if i will like (or have the balance for)

any tips?

I would be looking into classic style roller skiing vs the ski skating