One of our local library systems uses OneClickDigital, one uses Overdrive. I do have some experience with both systems. Generally speaking, Overdrive's catalog system is easier to use, but OCD is OK after you get used to it. I don't know if every publisher makes their books available to both systems, but availability on stuff I've looked for seems pretty similar with some authors missing entirely on OCD-- but this may simply be a factor of what the library has bought, since that library hasn't used OCD for that long.
There are some functional differences between the 2 systems. Most notably, if I get an MP3 title (drm free) from OCD, NO external software is required on my computer. I just download an MP3 file directly, store it anywhere I want on my PC, and drag & drop into my Sansa Clip Zip. This is a particularly nice solution for those with older computers, or non-typical OS choices. (i.e., as long as your computer will handle the log-in information required by the catalog browser/library, and you have some local storage, you should be able to get MP3 titles from OCD and transfer to the player of your choice.) Downloading titles in WMA/DRM format does require the OCD software to be installed (similar to Overdrive Media Console). (There are OCD apps for Android and Apple to skip the intermediate download stage, but I haven't tried them.)
In my library's catalog, titles run about 65%/35% in WMA/MP3 format.
Some oddities: I've only downloaded a few titles-- all required fixing MP3 tags with MP3Tag to properly work with the Sansa Clip, which is typically very forgiving about tagging requirements. The problem is that the multiple tracks are not tagged as being part of an 'album', which seems to be a pretty basic oversight error in OCD formatting. The books will play fine as long as you only have a single title loaded: but with 2 titles loaded, the tracks become intermixed as a result of the improper tagging.
If you use the OCD media manager software (required for WMA/DRM titles), it seems to insist on transferring titles into the players music folder instead of to the Audiobook folder. I found this unacceptable, especially combined with the tagging flaws, but did find that instead of using the manager to transfer books, I can drag-and-drop the folder from within the media manager program directly into the Sansa. (Apparently the drm handling authorizes the file during creation of the file on my PC, not during transfer?)
I have a very high speed internet connection (gigabit fiber), and have noticed that the files take a loooong time to download-- although this may not be any longer than Overdrive would take on a slower connection. It also seems to take longer to transfer books to my player through the OCD manager than through the Overdrive manager.
KentE
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