First time I took a shot at this. Always ignored this because of the not so nice screenshot.

Roadmovie seems to use QT for doing all the hard work. Snow Leopard can do all this converting as a standard. So to be a useful extra converter tool it should offer some extras like functionality and above all support for extra codecs without the need to install optional codec libraries.

Started to drag some vid files. Bugger, it doesn't recognize .flv (flash video) and .mkv (Matroska)?!? Really, this is not acceptable these days. Both are used a lot by many! If you want to be taken seriously as a converter tool both are a must have feature. At this point it already receives the tag 'Not for me'.
Did some more tests with plain standard video files (mpg, mp4, divx and xvid).
It could not play the xvid files. It just displays a black screen. Strange, because it accepts it nonetheless. Didn't try to convert these files but I am guessing it will not work either.
Come to think of it: A handy real preview of the final movie quality would be very helpful. This makes so more sense then just adding a fancy video player. A stitching feature would be nice too.
I convert a lot of video file to my PS3 so the next thing I tried was the PS3 presets.
In short, the PS3 480p preset seems to work. the PS3 720p didn't play on my PS3 slim.
I also noticed some graphics glitches here and there in the user interface and why the developer shows the progress in fps is a mystery to me.
Speaking of the user interface. It was a bit confusing at times. Some windows are not user friendly to say the least. Though I like the way it displays the files dragged into the screen.

Nuffsaid, this converter has some nice ideas but because it falls short on many aspects I cannot recommend Roadmovie all. A nice idea only isn't worth a whopping $25. Let alone its absence of some very important video formats (Again, FLV and MKV are must have these days !!!).
In the end it doesn't do a lot more compared to QuickTimeX which is standard in Snow Leopard.

Suggestion:
Handbreak is free and supports most video formats and does the job nicely. If you really want to fork out $10 I can highly recommend iVideo Converter. Both are way better and above all .. useable.