There are two versions for your 88u. Experimental and regular. If it were my router, I'd try the regular build first to see how it runs. If performance wasn't great or there were other problems, I'd try the experimental build.
**Make sure to hard reset after flashing**
Be sure you know how to recover in case the flash goes bad. Most Asus routers are thankfully easy to recover.
Read the wiki for appropriate wireless settings to get the best speed and range for your devices.