Hi Hans
John Hothersall on here (that's his IIS name too) has the Orion Optics SPX350 F4.5 with the ultra grade mirror spec so no carbon fibre tube but I think he likes his scope as far as image/optical quality goes (he has done some corker high res deep sky and planetary work!).. but perhaps he can fill you in on its portability status.
As you probably know I have the
AG12 also wth the Ultra grade optics, which is similar to the CT's but just faster, heavier duty and with the Wynn corrector and I considered that probably the upper limit for comfortable portability then once loaded up with my kit it is a heavy beast, so needs a good mount....and hence my quest to finally build it an
observatory 
Mike