Hey Nikko
Ya gotta love it! I bought mine last year and still revel in it's greatness daily. The real kicker is that there is STILL nothing on the market even close to the Empeg/Riocar and SonicBlue just don't make 'em anymore...glad I joined the club when I did...
Spare items are always good to have, especially if they aren't being produced any longer. A spare sled would be very useful if you plan on getting a second car/boat/motorhome/corporate jet in the future...you tunes travel with you no matter where you are...I would imagine that trying to get a sled in good used shape 2-5 years from now would be difficult when your ready to make that second install.
A second remote would be useful too, if you lose the original or break it maybe?
BTW, the Empeg store does serve customers here in North America, as SonicBlue's estore no longer carries Empeg/Riocar goodies (disclaimer - so I believe anyways).
Just some thoughts for you....