Why did you go back to the Panasonic?
Slightly smoother shave on the upper lip , 5 oclock shadow doesnt appear till 3 ish .
Thats it really , tried every top of the range electric shaver.
Philips Sensotouch 3D/Series 9000 , Braun Series 7/9 , Panasonic Arc 4/5 , Remington XR .
Found Rotary shavers are quicker than foil but not as close.
I have an anorexic face (chiseled as i like to call it ) so if your on the chubby side the Philips rotary shavers might be better.
Dont expect wet shave results , i also have dozens of safety razors . Pils,Feather,Merkur etc and can quite happily get a super smooth shave with them without the slightest hint of razor rash or blood, that will last till i go to bed , just i prefer electrics.
Also you do have to persevere with each shaver at least a couple of months , it does take time for your face to get used to the shaver.
I used each of the above for at least a year then chucked them on ebay as apart from the Braun series 7 replacement foil which cost around £25 the rest cost around £50 (dont bother with the cheap chinese clones they are terrible) and i couldnt even find a series 9 replacement foil.
If its your first high end electric shaver then you cant go wrong with the one chaparral linked above , the Braun 790cc-4 for £99 and you will probably get most of your money back in several months if you want to sell it , Panasonics dont hold there money too well probably due to the high cost of foil replacement and the fact that people know Braun are well known for shavers and not Panasonic (even though they have probably been making them longer than Braun).