I've been doing some folk-metal/medieval-metal songs and found the new model (v1.5) to have a superior audio quality compared to v1. I've managed to revise some of my v1 songs by using the 2-minutes-remix feature. The revised versions sound way better now in terms of clarity.
Some of my older songs are more than five minutes long, and I would love to be able to run them through the new model in one go. I don't care if that meant considerably longer waiting times for the generations. The more time-consuming part was creating them in the first place. ;-)