I think it is a good frame. There is almost zero welding on it and it uses huck bolts instead. You can't weld anything to it. I seem to recall some restrictions or cautions to do with installing a WDH.
Bal/Norco Ultraframe Jayco is using the frame but it does not have openings in the beams like the Lance ones do. It has been used on a few other makes and models in the past but I've only seen it on Lance and Jayco TTs at RV shows in the past couple of years.
There were problems with this frame about 10 years ago but I can't find any more recent reports of issues. You might want to go to the Lance forum and either search or ask. Perhaps looking at the Jayco frames to see how they differ would help.