From above,
"The prototype had severe problems, Finnish glue was of poor quality and there were problems with mounting the engine, although I'm not completely sure what they were. As a fighter it was not as maneuverable as 109 and at 6400m it's top speed was 620 km/h. Climb to 5000m was 4,5 minutes, service ceiling 11 000 meters. The prototype had two 12,7mm machine guns as armament."
According to William Green's Complete Book of Fighters,..it could "outclimb the Bf 109G-6 and was more manoeuvrable, but, as no funds were available for the purchase of new aircraft for Ilmavoimat and sufficient Bf109Gs remained to equip the Ilamavoimien fighter force that was permitted under the Armistice terms, the prototype was grounded after 30 hours flying and the programme terminated".