I suggest getting a compatible universal or learning remote soon - don't wait until the original remote is lost or breaks. You may need to program in one or more functions using the original remote.
At least, this way, you'll have a backup remote and won't be dead in the water one one fails.
I've been happy with the price vs. compatibility of the GE 5 device learning remote (got mine at Target). I've been able to use it with both DS and Zenith CECBs.