I've not heard the new work but I went to the current version of Plastic Ono band (with Sean Lennon) at the South Bank for one of the Meltdown festivals.
I found it all a bit disappointing. Yoko's vocals (a very important part of it) were mixed very low down in the mix and the whole thing seemed very tame in comparison to her work from the 70s.
Maybe I'll give the newer albums a listen and see if they are more satisfying than the live performance was.