I have DVD LAB (single VTS and one audio track) and it's pretty capable. The newer DVD-LAB Pro I hear is even better (multi-VTS and up to eight audio tracks).
But don't expect it to be an easy to use out-of-the-box program. There's a learning curve much steeper than Ulead's. And many of the features will probably never be used. I suppose if your customer wants some of those features, it's worth the effort to learn how to use them.
I don't know about you, but I'm not impressed with DVDs that have a load of gimmicky menus, background animations or fancy buttons. As a viewer I'll spend as little time as possible looking at them.
Fav quote - "Experience is whatcha don't get 'till ya don't need it no more."
System - Athlon 1.4GHz, Win98, Hauppauge PVR250 receiver and compressor.
Software -Magix Movie Edit Pro 10, Nero 6 + NeroVision Express, Moho 4.61, PSP 8.1, Bryce, Quicktime 6.52 pro, Goldwave 5, DVD-Lab.
Cameras - Panasonic GS9, Canon ES8400V, Canon EOS D20 and Canon A70