You do not need any more fobs as long as you have the two, and you do going by this post.
If you lose the larger fob, you can use the other one but it does not work the same way and is less convenient. For several reasons, it is fairly important not to lose the fob in the first place.
The owner's manual is absolutely a little convoluted and written in Japenglish, so it IS hard to follow. That said, you should learn how both fobs work, what you need to do when the battery dies in the primary fob (and it will....) and get a very general idea of how the system works. Again, I am talking about a basic understanding, not the ability to design the system :-) But that understanding will really come in handy when the fob battery dies and you can still ride home
There is a lot of information on this forum about the KiPass system, and I believe there is a sticky or two with a summation of how it works. If not, I would be happy to jot something down and maybe Jim can make that a sticky.
Brian
Regarding the FOBs. Yes I received one FOB and a second smaller version that's apparently backup. Thanks for bringing it up. Reading the section in the manual on FOBs is human anesthesia. Should I get a second FOB? I'm assuming these devices aren't cheap. I'm not crystal clear on what happens if you lose the primary FOB. You simply use the spare key? Sounds like they brought in the BMW team to design the FOB feature.