The Wittman main gear is prone to shimmy on hard runways if not set right, this is not nice on landing
The Wittman main gear can crack at the axle, worth checking
The sternpost is prone to cracking
gees that aircraft must have arrived a few times. you are supposed to flare before touchdown you know
shimmy in the main gear is caused by wear on the attach bolt at the top of the leg. if the bolt gets a flat spot or two on it the leg will shimmy.
if touching the brakes lightly gets rid of the shimmy then replace the bolts.
mine has been flying for 29 years and nothing cracked yet.
the original poster and his dad need to go for a flight with the owner.
judge on the basis of fact not hearsay.
