I have been a ProShow believer for several years...and I jumped on the plug-in the moment I heard about it.
Pros: It showed me something I didn't know about ProShow -- that it has global text input available.
Cons: It is slower to use the plug-in than to first export your images and then load them into ProShow...a lot slower.
Usability: I was very excited to be able to give my clients a ProShow of all their pictures WITH the file name on the image. This works really well for me as I give my clients the final files as jpegs (I shoot in RAW).
My testing process began with a completed wedding. I waited for it to finish very expectantly...and when it did....oops. The plug-in uses the original file name -- NOT the exported image name which is what I need my clients to see.
I was also not happy with the 'random' motions chosen by the plug-in as many of them were zooms from or to infinity (from nothing or to nothing). It also took a long time.
I redid the same wedding from my exported/final images and even that took a long time as ProShow can handle but is not 'happy' with the huge jpeg files (3-5mg).
So I re-exported (from LR) the 'final' adjusted images to a new folder at a much smaller size (8''x6'') and ProShow worked great. The random motions chosen doing it this way where much easier to adjust to make them work well and more of them didn't need any touch-up.
Conclusion: Since I love ProShow Gold and would recommend it to everyone that works (on a PC) with images (sorry mac), my workflow with it will be, to do a second export from LR of my final images, at a smaller size and then open ProShow and load them in using the global command to place the file name on the image (\f).
For those interested in the ProShow settings I use -- I time the image to 4 seconds and the transitions (all fades) to 1.5 seconds. I have adjust the file name to appear in the lower right corner as a "Grow Random" entrance and a "fade" exit. I use Century Gothic with a drop shadow and it is size 12. I find that this has an elegance that works and yet the size and motion do not interrupt or take away from the client watching the images. When I can get the client to give me some audio, I will add it but I also will give it to them with no audio (and tell them to put their own music on while they watch).
Clients love this.
If you are interested in ProShow - they give you 15 days free usage. I would suggest the middle level (GOLD) for everyone. "Producer" is much higher priced and although it has some nice features, I would (as a video guy background) use a video editor at that level. It is actually very complex. GOLD is very reasonably priced and has been at the top of my personal list of software that does exceptionally well what it was designed to do. I have probably sold 6' copies of it for them...!
jeffrey