Only heard of this earlier today so was perusing through some Youtube video's and found this one to be the most informative if not a bit lengthy but worth watching. Certainly not worth the price , as she comments as well, considering even here in Canada you buy a Classic for around $200 - $240 cdn and the Ultra Power etc for less than $300 at many stores.
http://https//www.youtube.com/watch?v=4mImXY_tvFo
http://https//www.youtube.com/watch?v=4mImXY_tvFo