the answer to your first question is yes, it is a professional software and its very a powerfull one too!
the answer to your second question is, i dont know anyone from here, but Vector Lovers made their album Capsule For One entirely on Reason!
you are probably new to this whole computer music thing so, i suggest reading and researching alot instead of trying to bang out a tune as soon as you can a get it released.
this forum has alot of very informative topics, which will help you alot and if you are really a beginner go to
www.computermusic.co.uk and check out the tutorials there, they are good for a start, but dont stop there dig deeper, learn about synthesis.
you know, like a guitar or piano, reason is a huge instrument too, learn the theory, practice alot and master your instrument.
but anyway, it does sound like sh!t what i wrote so do what ever you want actually, hell you can even pay an engieneer to make u tune and you just write your name on it.