I purchased a DSi LL (Japanese) from ebay and it runs games extremely well if you use unlaunch. I'm able to run the hax from my SD card, as I prefer not to install the hack directly onto the DSi. Its pretty much a perfect situation.
Only...
"We'd prefer our customers don't use emulators for their speed runs, so we aim to provide a platform for them to speedrun specific levels that we've approved!" /s