When I first started teaching I was the golf coach. I had crappy clubs I bought from a pawn shop years ago and not much money. My dad bought me a custom set of Lynx clubs he got from an old, short fat guy that gave up the game. Eventually I grew into them.

I wound up purchasing a full set of new Callaway XR clubs and have spent considerable time at the range as well as playing 2-3 times per week. Result is some encouraging improvement and a more positive attitude about golf. Before, I was real happy whenever I'd shoot under 100 on our championship courses. As of now, it's consistently in the low to mid-90's which I can attribute to better clubs and the added practice. A friend who is a good golfer can hit my old clubs very impressively so perhaps it's just the mental aspect. Whatever, I did not try the "One Club" brand and it doesn't sound like anyone else has either. Thank you for all the comments.

You don't end up with only one swing. You still have wedges and woods with different shaft lengths. You may find you lose accuracy with your 7-9 short irons with a 6 iron shaft. You may lose distance with the 3-5 irons because of the shorter shaft. I tried them several years ago; didn't see much in them performance wise, and sent them back. However, they did seem to be good quality construction.

Being "custom" doesn't mean a thing...
 

unless they're custom made for you...no need to "grow" into clubs now-a-days...

Even if someone else had used them...
 

and liked them would be no reason for you to buy them based on that. Clubs, brands, style fit each person and you can not relate someone else's experience with any golf equipment to what you can expect. It does not work that way...just like you can spend all you want on clubs, but if you aren't willing to put in the practice and lesson time it will take forever or never to get decent(depending on what your goals are.