The remote that came with my XRS4000 was the worst. Scrap #1. I then bought an IR-1000L. It was just as bad as the original. 3 or 4 key presses to get a response. The pretty little red light on the unit flashed with each key press, but that was all that happened. Scrap #2. Then I purchased the ARQ-100, and what a difference. This unit is super responsive ,and each key press produces a quick result.
If you are looking for a super replacement, spend the extra few bucks and buy the ARQ-100. Oh yeah - it also comes with a free keyboard on the back.