any sifu would like to comment on this?

learning about this 8 heart 8 arrow thing that is promoted..

12 o'clock arrow body and head very slightly misaligned. Anyway, arrows look good overall, but of course, this does not mean the heart is as good. There can be bending tips at the tip of the hearts. That aside, focus on proportions first. Getting the right proportions is crucial for the diamond to perform well. Avoid stones with pavilion angle above 41.2 degree, like 41.4 degree. And avoid stones with crown angle 36 and above. It is rare for 36 degree crown angle stones to perform well under idealscope and ASET.

What is the specs and price od this stone anyway?

Let's start with proportions first.

For a diamond to perform, there is a sweet spot of proportions. For example, if you saw a diamond with pavilion angle of 41.4 degree, you can avoid it. It will be 99% leaking light. From naked eye, it still look white, but when you try to move it around under a light source like a smartphone flash light or probably even a fluorescent light, you will see the difference.

Next, we talk about hearts.
Hearts represent how precise the overall cut is. Even if the diamond has good proportions but with bad hearts, like drastic uneven heart size, the diamond will probably have serious problem at one or possibly more sections of the diamond. The proportions of a diamond is actually based on the average of a few sections, for instance, the crown angle is actually based on the average of 8 crown angle sections. So assuming one crown angle is extremely high while another crown angle is extremely low, what do you get? Yes, you will get a balanced crown angle because 2 angles add together we get the middle sweet spot. But when the hearts are good, the diamond will be well-balanced and the discrepancies between 2 angles will be small and if the average is a sweet spot, that means both angles should have decent angles.

While good looking arrows may usually bring pretty balanced hearts, that does not mean the hearts are polished to great optical precision. To gain great optical precision, more time will need to be spent to polish it, which equates to higher price of the stone. Does great optical precision means better performance. Personally, I would say yes, although the differences can be subtle the some. To me, performance images like ASET and IdealScope are more important because those will show you how the light reflects within the diamond itself.

For the below example, although the hearts are not cut til a higher degree of optical precision, I find that the ASET is pretty decent. For the lower price, to me, it is worth considering as well:

This diamond sells for approximately RM 4500. Although it has faint fluorescence, it is highly unlikely that it will bring negative impact to the stone. This is what the card that comes with my GIA stone says:

The fluorescence is one of the reasons the price is lower most likely. The other reason the price is lower is because the slightly lack of optical precision, whereby the tip of the hearts are bending. BUT, this will definitely be one of my shortlisted stone, for those looking for a budget, but peforming stone. In fact, this stone is already better than hell lot of stones.

Back to your case... advice is get the proportions and the price first.