Trickster is the best app I've found for accessing recent files (and I have tried them all!). I like the ability to create categories that are limited to specific folders and file types, as that allows me to find certain files quickly. Some other similar apps also offer this feature, but in my experience they miss some files. Trickster shows me all files that have been opened or modified, including files in my Dropbox that were modified on another computer.
One of the (minor) downsides of the way Trickster is programmed is that it shows files for any modification, including hiding the file extension or changing the colour label, even if the file has not otherwise been modified.
There are two reasons I'm giving Trickster only four stars. The first is that it occasionally goes nuts and eats up a lot of CPU, as others have reported below. I only encountered this problem once in the two weeks I evaluated Trickster before purchasing it, but nevertheless it is an issue. The second reason is that the selection of icons to assign to categories is fairly small, with no option of adding custom icons.