I've owned two 4.5" Starblasts. Nice scope. I've also owned the 6" F/8 Orion XT6.
IMO, unless the bulk is an issue, get a 6" F/8. It's not that much more than the Starblast or the 4.5" F/8, but is an order of magnitude better 'scope experience, overall.
The Starblast is nice, but it's main issue isn't coma, it's the fact you need really short focal length eyepieces to get any significant magnification. Coma is an issue, but the price of the wide-fields necessary to make that an issue rapidly approach or surpass the cost of the 'scope itself!
The Moon is a classic example of the magnification issue. To fill a Plossl eyepiece with the Moon, for example, you need a 5 or 6mm Plossl to get the 80x or so magnification, meaning eyepieces with really, really short eye relief. Short focal length eyepieces with good eye relief typically cost >$100 apiece. I remember routinely using my Nagler 3-6mm zoom to get enough magnification for the moon on my Starblast, and that's a $400 eyepiece these days
What the scope is really good at is wide-field. Unfortunately, to harness that, you need expensive wide field eyepieces like the TeleVue 24mm Panoptic, and to track down a 1.25" Televue Paracorr, which is harder to find than unicorns.
OTOH, the 6" F/8 has a decent focal length (1200mm) meaning much higher magnification for the same eyepieces, which can reduce the eye relief problem for cheaper eyepieces. That same view of the Moon can be had with a 15mm Plossl, with >10mm of eye relief, much more comfortable. At F/8 coma is not an issue, and the light cone isn't steep, meaning simple (generally cheaper) eyepieces can work wonderfully.
The Orion 6" F/8 also can be carried outside one handed, as one piece. I did that while I had it, the handle and balance is good.
Sure the 4.5" F/8 would be easier to transport, but the 6" has 33% more aperture for not much more money.
So my recommendation is the 6" F/8, with a handful of Plossl or other cheaper eyepieces that will work great with an F/8 'scope. The Starblast is just too short a telescope for a starter telescope, IMO, as most of the easy showpiece subjects (like the Moon/Planets) really require significant magnification that is just problematic with that focal length and price point.