Hybrids are different in many ways, not all "more betterer"
- lower perceived cost in larger impulse launches (ie consumables, not in support equip etc)
- novel flight differences - longer thrust duration, different sound, lower thrust level at higher impulse etc
- higher complexity - need to bring a lot more gear to the launch, actual launch is more complicated (more to go wrong, more to think about)
- no engine delay ejection ie must have independent recovery control system
Some of the most 'fun' launches I have done were 2 stage with hybrid sustainers that had 10s+ burn times
Another real crowd pleaser I can remember was TPs at WWW2010*?) that was 'going into orbit' as TP put it.
All that being said, they are interesting and in bigger impulse flights will be the way I proceed mostly.
There does seem to be a limit that commercial motors hit around the M class and indeed not many manufacturers seem to be about for the long haul.
CATO - happy to assist with any questions you have and with GSE etc.
Oh by the way, anyone bought N2O lately? What is it costing nowadays?