I used the UOG to WDW heavily this year, and also bought the UOG to DLR in 2005. WDW vets know how respected the UOG to WDW is, but the DLR version is not nearly as respected.
FWIW I read something on the UOG website, or somewhere, that the author was frustrated with the UOG for DLR because the publisher made him remove lots of good info to meet a page limit. This would explain why folks find the DLR version of limited use. I also read that the publisher had changed its mind and will now allow more pages, and so the DLR version will much improved in upcoming versions.