What I've found with the MegaWatt type of power supplies
is that the voltage regulators and the current limiters aren't
very good.
I've blown 1 MegaWatt so far and that was being used for
LED strip lights. The current limiter went in that also.
But, I was just curious. Like I said, I never even thought
of using one of those type of supplies for a radio.
Being in electronics for 25 + years, I found that I trust a
power supply with a nice hefty transformer rather than some
IC chips