What Pride probably means by "its not a solid build", is that it is somewhat cheesy. You can get into scvs and make the other player QQ, or you can get booted by marines on a cliff and be pretty far behind in tech, econ, and army mass. Banshee openers are also more difficult to defend since you are building reapers (although they will also have less marines to defend your attack). Also contributing to the "cheese" ness of this, is the luck involved. You have a few places to jump up into each base. Maybe he has 3-5 rines there, maybe he is somewhere else. Luck sometimes determines if you raid is a success or not.

In any case, I dont do the build myself, but my experience vs it, is that if they kill anything less than 5 scvs its a pretty easy win for me. I get seige first, drops first, and my econ is better. I will also say that I have definately lost to this before as well, when my marines were not in good positions. I would probably look to this build as more of a BOx tournament play, expecially if you know an opponent has a propensity to go banshee or some other marine light opener.