the curved layout felt the best to me.
Well, if only you play a machine... then it doesnt matter much... but...
I have not had anyone complain about it when they come to play it.
I think this needs clarifications. For example...
1) Maybe all of your friends have very large hands.. thus a wider finger spread.
2) Maybe these people have never played something like SFII on a real machine... or are limited in fighting game ability / understanding.
3) Maybe these ppl didnt want to hurt your feelings.
4) Maybe they just didnt care, cause they dont really play often at your place, to warrant even mentioning it... which leads to #5...
5) Even if they mentioned it, they know you are not going to be rebuilding the thing on the fly, or just because they had issues with it...
some may even think rebuilding a panel, is like the amount of effort needed to build an Ark.
So, my point is... that while you larger handed people may not have an issue with such layouts.. a lot of smaller handed people
will not feel it very comfortable at all. Ever moment is a strain on the fingers, just to keep your fingers on the buttons... which also happens to make your hands too tight... and thus slow down reaction times considerably.
Remember the humble Keyboard? Probably 98% of PC Keyboards out there are flat alignment. No matter how much ergonomic designs have TRIED to change this... none of their efforts have been widespread accepted and appreciated. And thats even with store displays in which you are actually able to physically test the feel of the things.
The so called Ergonomics of Arcade buttons is largely a farce. If you place you hand FLAT on the control panel / mock up sheet... then sure... your fingers will extend to various lengths, making a nice curve. However, you cant press a button with a flat hand. Same as you cant type letters on a keyboard with a flat hand.
Pressing a button with your hand flat, caused the middle joints to lock in place. Thats like trying to hammer a nail in without bending your elbow! Your losing all the natural leverage you get from bending your fingers. Furthermore, the buttons are designed for direct downward presses. Not angular force (you would at least want a wedge shaped top for this) , nor even subtle taps... because most buttons have a fairly long travel... AND, most buttons have microswitches which cause major fatigue after long duration, especially if you are using them in an inefficient way.
The biggest problem with Ergonomics... is that every person is differently shaped. And so what works wonders for one person... will be HELL for another. This is why certain game companies controllers, have made customizable adjustable controllers.
A few things to note about Curved Layouts:
Most of this got popularized with NeoGeo, because of Samuri Showdown's requirement for hitting all 4 buttons at once.
The NegGeo control panel wasnt very deep.. so they chose a narrow button layout to make up for that. Games like
SS, would have been very difficult to impossible to span 4 buttons in a perfectly lined up manor.
The Neo layout works ok with SS, because its a very simple game, and only one button is shifted inwards. Usually you only use two nearby buttons at a time... so you can slide around pretty easily. The closer button helps you with a reduced span for all 4 buttons at once. However, if you had to try to use that as a normal action repeatedly all during a game session.. you would really be strained if you had smaller hands / finger spans.
Another thing about Curved Layouts on Real machines...
Many of them are on Japanese machines, using Japanese flat, or convex (dome), topped buttons. I believe their micros might be a little less pressure to activation as well. This helps with the ergonomic issues discussed above.. But its still not the greatest solution.
And personally, I cant stand the feeling of convex buttons. I really love the
concave buttons.. how they hug your fingers nicely, and help keep your fingers locked and centered on the buttons. My only gripe, besides the Fatiguing design of microswitch / hard-impact buttons... is that they are just a little too big. Knock off a few MM, and you would have less issues with span.. as well as could get more controllers on a panel - with less predicament. Maybe even make a Drop-In 6button assembly.. so you only have to drill / route one square hole, instead of 6 individuals, with all the alignment, mounting, lighting...etc.. all built into one easy drop-in assembly.
So in summation... make what you want to make.. but be aware that others whom may use your contraptions might not be as thrilled with it as you, even if they dont speak up about it.
All this is coming from a guy who thought he was genius being the first? to make a curved 6 button arcade button layout. That panel got scrapped quickly.