I've started using my Arturia Polybrute for live gigs, because, well because it's one of the best synths around. The soft cases are useless and it's very easy to damage your synth with them.
This however is a game changer. Yes the case is heavy and you might want t9 consider getting some wheels to help move it (the only criticism I have of this case is that it does not have castors on it), but I am so glad I bought it.
The polybrute fits snugly inside and the soft lining and well arranged inside foam plates keep it stable and secure when moving to and from gigs/ rehearsals.
I'm also surprised at the price, which is very reasonable, and I have to say both the interior and exterior build quality is exceptional.
The only real gripe i have is that as the PB is pretty heavy already, adding the weight of this case to it means you need a bit of upper body strength to carry it, but that's a small price to pay for ensuring my synth doesn't get dented.
If you have a polybrute and you need to.transport it, this is the case to buy. Pretty fast shipping to the UK too.
Overall, 9/10 and the only thing that could improve it would be built in castor wheels on one of the ends, but nothing that cant be solved by getting some cheap dolly-wheels to help you move it.