How good is it?
The Korean octave mandola is quite a decent low-priced instrument; a good design, made from good wood and built with a very stable production quality. It can't match a top-quality handmade instrument of course, but that's not a fair comparasion at all.No matter what name there is on the peghead, this is a decent beginner/intermediate octave mandola with a solid spruce top, solid maple back and sides, rosewood fingerboard, gloss finish and a slim, playable neck. It can't compare to a professional, hand-built instrument of course, but for less than 500 dollars it's well worth the money. (I've heard of them being listed for up to $750 though, and that is daylight robbery!)
One detail that may or may not be a problem is the very short neck. It makes the instrument very easy to play and it allows you to tune it up to CGDA tuning if you want to - although if you plan to use that tuning on a regular basis I really recommend you buy the mandola instead. The downside is that it's hard to get proper tone in the bass range. It can also be difficult to find strings for such a short scale. It seems all string brands have chosen 012 as the gauge for their octave mandola string sets and that's a bit on the light side. You really need a 014 or 016 set to really get some sound out of it. You won't get ready-made sets in those gauges so you'll have to buy individual strings. (Btw, the instrument actually comes with 011 strings, and that's way too light for GDAE tuning. So the very first thing you should do when you get one of these is to change the strings!)
Even so, quite a few octave mandola players like this short scale despite those problems, and if you want a longer neck you can always consider the Irish bouzouki variant instead.