For future reference, should you of enclosed that link with "< link >" (minus the spaces and qoutation marks) it should become clickable: https://asgardia.space/en/forum/forum/technology-104/topic/practical-and-cheap-way-to-get-into-orbit-1554/.
Hybrid rocket motors have been about for some time but I've not seen much practical developed and deployed for long term operations - been a few test flights. Bloodhound SFC uses a hybrid rocket motor, too, tho that isn't aiming for orbit. Overall, yes SSTO should be a goal, but multiphase right now is more probable. I don't think it matters much from how the lift is achieved, overall, the key requirement at the moment being driving down the cost to do so - hybrid rocket motor is a viable technology - but ultimately long term we should be seeking options that operate sans propellant - can go a lot further, and things can operate for a lot longer.
To ignore Blackstar, X-37B, XS-1 etc then the spaceplane scene is pretty thin. There's one with an operable test model, I can't seem to find it, of other things still in testing/design Virgin's imaginitively named SpaceShip2 is gearing up ready for actually punching out of atmos. They've tried this before, re-entry wasn't smooth. People died. Rel's Skylon system uses SABRE engines, I'm not aware of any test flights for that planned before 2025, It's still design phase, but shows promise.
http://commons.erau.edu/ijaaa/vol3/iss2/4/ looks interesting. I wouldn't want to be piloting when my craft suddenly counters a few tonnes+ of kinetic transfer from the "catapault", then suddenly gets a few tonnes lighter, in thin atmosphere. That sounds fun.