They are Kubota-based, and a damn good motor. They cannot, nor do they try to, rip you off for spare parts as the motors are often found in fork-lifts, and other uses. I have checked some of the spare parts prices, and although not cheap, they are not a rip-off.
They are quite high-revving, so there won't be much of a "chugg-chugg" to them. They have the usual Japanese quality. They have a cast-iron block and heads. They are not that heavy either.
On this motor, it looks like the gearbox is air-cooled, and so doesn't need plumbed into the coolant feed. Others are liquid cooled. It looks like the 'box can be removed easily too.
They say that the canshaft is gear-driven, so you won't have to suffer the uncertainties of toothed cam drive belts.
I know one guy that has one and speaks highly of it.
The 38 hp Kubota will be my next motor. My own motor is a good one.... the cast-iron block 35 hp Volvo MD17C.... but the spare parts prices have been descrided by one as "lunatic". I have noticed.
I have no latent or formal interest in Beta Marine or Kubota.