The silicone is for keeping it clean. How many people are going to be using it? If it's just you. I don't see it as a big deal to get right away. If I younger kids doing it I would consider getting one. My sister has one and the kids run around barefoot outside and then came in and played it. It got a bit dirty.
The Batter pack I feel is worth it since you can charge it when not in use
and it will always be ready. I'm a big believer in rechageable batteries. Now the matt I bought but I don't use it. I think it said something about you might want to use this for thick carpet. I don't have the book handy but it does say something in there about it. Mine works just fine without. I do use it for my other workouts. So it's not a waste and it is nice thick one. The carrying case I didn't buy since I won't be taking it anywhere. I just put in the box when I finished. The controler comes with the Wii game. The balence board is purchased separate you get the wii fit game with it. I hope this answered some of your questions.
In the middle of difficulty lies opportunity.
"We do not know the true value of our moments
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In Memory Of Lessofsarahtolove