I use mkv2vob right now and i like it for the most part. But sometimes it takes 8-10 hours to convert a file and that's just crazy. I play them on my ps3 by the way. So are there some options that are better/faster?
Depends on what video and audio you have in the MKV container, might be as simple as demuxing/remuxing, a few minutes job. Download MediaInfo and see what you have. Have a look at a problem similar with yours, read from here down: http://forums.afterdawn.com/t.cfm/f-200/conversion_of_mp4_to_m2ts-831649/#5018813