Been meaning to get a copy of that omnibus for some time now. I own original copies of issues 12 and 15 (Doomworld and Star Duel) and I want to read the rest of the series, but I don't think it'd be economically feasible to get them all individually. So I'll try for the omnibus.
Unfortunately, it seems they've gone out of print (and the new collections are way more expensive for whatever reason) so I should probably pick one up sooner rather than later.