your milage may very.... after a couple of hours of any mix, i find i get tired of it. sometimes disgusted even.
you should know how you like things to taste at different stages in your rides. hour one is always different than hour 4, 5, or 6..... when your stomach is shouting 'no mas!'
but, i have done the double or triple strength mix. if it can be tollerated, it can work. always, always, always drink a ton of water after every sip of the thick stuff. the more powder in the mix the slower it is digested and taken up into the blood stream. water dilutes, speeding the process.
there are sags with real food every so often, so at least you will alternates available.