Tycho has experienced a massive amount of development with regards to better memory management, multi-processing handling, data storage, etc. Additionally, we have now implemented supernova detections w/ proper handling, effective planet patching between encounters, improved simulation of planetary systems with the use of SecularMultiple, etc.
This is a fully functional pre-release of Tycho. There are some final user-improvements that will be coming in 2.0, but if you want to start using everything now, you certainly can.