I'm a hyperstar user and have to agree with HOughy. It's a brilliant system but its not that flexible due to the time spent having to re-collimate and re-balance between swaps. It's not too far off, but enough to be a pain and I have mitigated the balance issues with tube mounted counterweights.
Having said that my problem is exasperated by using the 14" version and there is no way I could swap tube assemblies by myself so there is no other option.
Bite the bullet and get a RASA though, once you try F2, there is no going back
