Pics are useless when it comes to epon. This is player profile all the way. It's shorter heel to toe, the top line looks about half of the 503, thinner than the 303 and dec shorter heel to toe than the 303. Offset looks about half when compared to 503, actually looks the same as 303. I have all these heads and have done visual compares...not gonna post pics because they look so different than in the flesh.
This is a great looking head! Reminds me a little of the 551 with onoff kuro thrown in. They did a great job hiding the pocket cavity. Mine are being tweaked a bit right now, different shafts so going to reserve judgement until I hit them but have seen them in the flesh and these look to be the true 400 series...if I were to assign a number at this point it would be 453. Based on looks alone they appear to be a very forgiving player profile.
Am more excited about this set than any previous epon sets...I think because the size is perfect for me and I think these will play pretty long and forgiving...am thinking a half club shorter than the 705 without the occassional hot shot...what will make or break these and what I'm most facinated about is the feel...am hoping the one piece forging will make these feel soft and deep like the 303...if that turns out to be the case, I may have found my grail irons...