As you can imagine, they were not very successful. I think the Leonidas Squadron's only success was in destroying a lone railway bridge over the Oder, as the Soviets made their final advance against Berlin. They lost several dozen pilots to destroy that one bridge (something like 30 or so), which was a rather high price to pay.
The other group, Sonderkommando Elbe, I think only succeeded in downing 20 or so Allied bombers.
Hardly spectacular efforts.
If I remember right too, the Nazi leadership, even Herman Goering, were rather unenthusiastic about the whole thing.