OK Ill bite :)
I have thought about the Oscar a bit, it does have a good sized boiler and I havent read of any owners complaining about the plastic body, they generally seem to like the body work, but, there always seem to be a but, IF I had one, going by what Ive read elsewhere I would be looking at retrofitting a OPV on the cold water side of the boiler, and a vacuum breaker as well.
Anyway site sponsor Veneziano sell them so they would know how to set them up so they give there best.
Dont know much about the Ascaso but if the brew boiler has a standard button thermostat you could find yourself temp surfing like us Silvia owners or fit a PID, but if you add the cost of a PID onto a $1650.00 machine your up into another price bracket once again site sponsor Di Bartoli would know whats needed to get the best from the Ascaso.
Probably stick with what youve got till you can move up into a nice thermostable HX, as an example read Lucas review of his Maver Makin
yeah I know you dont like the look of it , maybe the Diadema Junior would be more to your liking.