I initially did it that way too. Everything including my WIFI worked great EXCEPT the GPS. I used Odin to flash back to stock DI18 then used Odin again to update using the full DK28..... .tar. And since then Everything is working perfectly IMHO. Yes, it did wipe my phone and I had to d/l and reinstall all my apps taking about a half hour of my time, (I'm getting prettty good at it having done it a second time after trying to run a batt icon mod .zip in recovery that locked up my phone resulting in reflashing the DK28 a second time (I hadn't run a back up--silly me). But let me tell you--I have the best running GPS that I have ever had. It is well worth the effort.
Besides, it will give you experience so that when the Official is released, you'll be flashed back to stock and having the OTA update your phone in no time.
If you want help with that, you can look here:
http://androidforums.com/epic-4g-su...-help-going-back-di18-eclair.html#post1988488