In any case, it's far too soon to say whether Red can mount a viable challenge to established projector manufacturers. (inc.com)
He said the Demos campaign was doing well enough to have been a viable challenge to the Altschuler campaign in a primary. (easthamptonstar.com)
I myself have enjoyed my time with it, and whenever I can either safely save or safely block off 4 + hours, I'll keep it in mind as a viable challenge. (psnstores.com)