Yep and yep. I think that crystal rye tastes like caramel and subdued rye. In fact, I'm not sure that I could tell the difference between it and a rye/crystal 80 mix. That being said one of the few recipes that I'm truly happy with that I've developed uses it and isn't quite the same without it. It's 8 lbs pale malt, 3 lbs rye malt, and 0.5 lbs crystal rye. Tried the same thing a couple times with various crystals and it's just not as good I don't think.
Back on topic, my personal preference is to avoid going over 5% with crystal anything in a pale ale, which is what this will probably be like. Your tastes may be different. Likewise, I prefer a lot of rye in my rye beers, most people don't. I would say that this beer won't be bad, but the rye will probably be overpowered by the sweetness of the crystal malt. It certainly won't be bad, nor a waste of money. I think you should go for it. That way you can decide what you like/don't like about this beer and build a recipe from there.