The first one is a big old EKO nicknamed 'The Beast' and it was given to me for something to practice on. It's a beautiful sounding guitar and I haven't given up on ever being able to play it - I do hope to one day. The new one is a Yamaha. There is a marked difference between the way they sound - even my untrained ear can hear it.
While there is only .mm's in difference in the neck I can now reach the tip of my thumb on that top E string so eventually I'll be able to mute where I was beginning to think it wasn't ever going to happen on the EKO cause I couldn't even tip the string. So I figure over time my reach and stretch will improve and eventually I'll be able to become friends with The Beast
The string set up (sorry I don't know the correct terminology) is a lot different on the EKO to the Yamaha... ie. there is twice the amount of distance between the strings and the fret on the EKO as there is on the Yamaha so a lot more strength needed to hold the strings down on the EKO and a lot more painful. I can only hold a chord for a couple of seconds on the EKO before the pain in my fingers gets me. It just about rips my nails from the nail bed. Its excruciating to do 5 mins practice on the EKO. So I will keep up the practice on the Yamaha simply because its not so painful. Its hurts but its not excruciating.
Definitely as you say Phil, better quality is worth it in the long run and I get what you're saying - I did jump in quick to purchase the Yamaha... but its a pretty good guitar. It sounded amazing when the guy behind the counter played it - very different when I do, so its me not so much the guitar LOL. But I will keep what you've said in mind as I'd never thought about buying a used one, so that's something to think about for future guitars.