Exercise bikes

Does anyone have an exercise bike at home? I was thinking of buying one for home cardio but am not sure...i don't want it gathering dust! Does it make your legs really bulky if you use it regularly? Is it a good calorie burner?

Help much appreciated!

I have one and use it most days for about 20 mins. It hasn't made my legs bulky and has definitely helped with weight loss.

I've got a second hand one now and I'm going to start using it...there's some workouts on YouTube I might try out