Personally I find Blender's learning curve a bit steep and it's user interface very outdated - but that's personal taste. It does have the most reliable import/export capabilities of any program I know - good to hear that there is a good .ase export script now. Some of the earlier ones had problems.

How much have you tested it - particularly with objects with openings? One problem that Biturn has is keeping surface nomals correct when you have openings for doors, windows, etc.