VHM aftermarket cylinder head

[GG27]

I have found a link on the German gasgas-online.de forum that sell VHM cylinder heads for EC 250/300 s. They have various squish band thicknesses, 1, 1.5 and 2mm which are easily interchangable, all having a cylinder head volume of 20.6cc.Looks trick but price is a bit high at 245 Euros!
Is it worth it or should I just shim my head and increase the volume to 20cc?

 

[GG27]

Anybody out there??

 

[iancp5]

If I felt the need to get the squish corrected I'd probably buy it just because it gives options.