Hi, I was involved in the purchase of the SF25 Turbo (qty 3). It far better then the Vigilant (G109B) for many reasons:
greater take off performance - for EFATO options
lighter weight
great cockpit weight limits
lower fuel burn
modern engine with full support
ease of repair
great visibility with less cockpit furniture
The Australian aircadets bought 11 ASK-21 Mi in a short time scale. Something to say about the bonuses of the ASK-21 design!