Jan - Gigastudio. I invested a lot of money in Gigastudio and Tascam ran it in the ground. I had GS3 and a lot of 3rd party libraries. I never did buy GS4 when it came out, but was planning to eventually. GS4 was only on the shelves a couple of months when Tascam announced it was a dead product.
So in order to update my library, I had to invest in Komplete and port as much of GS over to Komplete as I could. not everything transferred and some of the stuff that did still wasn't correct (i.e. keyswitching on a lot of instruments didn't work any more).
I could have just continued to use GS as is, but it had problems which needed to be fixed anyway, which I had hoped that GS4 would have solved. part of the problem, however, was that the key gen needed to install it was flakey. it required an answer / call to the server for installation and I was afraid that the support for that would eventually go away.
TASCAM had "acquired" GS from another company, can't remember the name right now. they got rid of that company's management and most of the programmers then they designed GS2 & 3 themselves. running the company into the ground by the time GS4 was released.
writing on the wall...