I have both the regular and Mini Dejavoo, and I love 'em (just purchased the mini from this site). The Lum's are very easy openers, but the liner locks are the weak spot. While the access to the liner is very good in terms of thumb "purchase", I distrust the strength of the lock on both knives. On the 740 (larger), the liner is a bit thin, but locks up good. The 745(mini) seems to have a stronger liner, but it stops a bit shy of where I would want it. I do think I can fix it easily by removing a few microns of material from the liner, or polishing it a bit. The liner issue would concern me for heavy use, but not for day to day tasks.
The handles on both are a very comfortable sculpted G-10, and the flat ground, leaf shaped blade is an awesome slicer. One handed, these open easier than any knife I have. The 740 can be flicked open with the wrist (no thumb action required), but still stays closed solidly. The 745 wont flick open, but the action is very easy.
One of the nicest feature is that the pocket clip carries very deep, and the knife is practically invisible in the pocket, except for the clip (tip down). Also, the clip does not affect the ergonomics of the grip very much.
I think the Mini Dejavoo makes a great EDC, but the larger 740, with an almost 4" blade is a bit much. S30V is another selling point, for me.