I can only give you my views on my own cars, although some here may disagree with it.
I got back into this after about 15-20 years. I completely rebuilt my old vintage Terra Scorcher, to modern specs. Brushless, CVs, billet shocks, full bearings, clamp on 12mm wheel hexes, etc, etc.
The car was tight and accurate, and smooth as silk. It was a rocketship, and handled awesome. Weight with a 3000 nimih pack was about 1500grams.
The problem? Well, vintage Tamiya plastic doesn't deal well with big on-track air.
So I figure it's time to get a modern buggy. I bought a DB01 Durga and a 501x. And to my surprise, I was amazed at all the slop both cars have. The front and rear suspension have tons of play, you can move the wheels all around in any direction. These are supposed to be modern technology? My 20 year old Tamiya has way less slop. Also, and I know plenty here will disagree, but the wheel attachment on these cars is a rediculous design. All 8 wheels on both cars would wobble when spinning. I solved that issue by converting both my Durga and 501x to DF03 wheels using the Yeah Racing 12mm hex conversion kits. Now all the wheels spin nice and straight.
But yeah, my cars have tons of slop too.
And here's a trick for the axle to fit better in the bearing:
Take a small pointed punch, and stamp 4 dimples around the axle stub at each point where a bearing sits. It will slightly expand the metal and make it fit nice and snug into the bearing. You'll get rid of a bunch of wheel slack just from that alone.
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