You are very timely, Volker. I was just checking out WLD3 this morning. The integration with Interactive Brokers and E-signal sounds great.
Yes, we still use Tradestation 2000i and I have no plans of using 7.x because they don't have Eurex data or connectivity. At some point we are going to have to migrate from this obsolete and unsupported platform and Wealth Lab is the top contender. Right now, though, the pain of moving still outweighs the advantages. We've got a lot of Easylanguage code that would need to be rewritten.
I have recommended Wealth Lab to many people and will continue to do so. If I were starting fresh without legacy code I would probably choose Wealth Lab.