I've used the Hegner multicut 1, but it is basically the same.
The simplistic design combined with a high quality build, means they are easily maintainable, and spares are easily available.
The blade block clamps are brilliant, and easy to use, but are just as easily lost! If you break a blade the bottom block tends to part company from its cradle, and disappear down some crack in the space / time continuum!
I don't know the axi machine, but I know of one big difference between the Hegner and all other modern machines. The Hegner does not have a hold down foot for the workpiece. You are reliant on hand pressure to stop the work riding up with the blade. The Hegner is the smoothest scroll saw I have used, so it is not so much a problem, unless your fingers are as fecked as mine.
The problem with the more modern machines is that spares quickly either become not available, or extortionate in price.
I was recently quoted £25 for a replacement plastic guard for a sub £200 machine!
Saying that, unless you intend to take up scrolling full time, or want to hand the Hegner down as an heirloom, I'd probably opt for the axi.
If my electric scroll saw breaks down, I always have the Hobbies treadle one as backup.