One of my favorite bike component additions this year has been the E13 XCX chainguide. Ask yourself, "Self, when was the last time I shifted my front derrailleur here in the Midwest?" My answer to this question would be over a year ago! I have ridden the MRP chain keeper and still had trouble with it bending and not keeping my chain on. However, this is not the case w/ the E13. It is SO solid and easy to adjust...I set it up at the beginning of the year and haven't touched it since. I also haven't dropped a chain all year even on the roughest of decents including the DH race at Mont Du Lac! Anyway, I will be putting one of these on my snow bike (the direct mount one is awesome too), and all my bikes next year.
So, do yourself a favor and drop 1/2 lb of your bike the cheap way. Take that front shifter, front derr, and those extra chainrings off. Put one of these babies on!