I loved him in Zappa's band, Vinnie Collauita praised him for his natural sense for polyrythyms and odd time signatures, but I don't know his work outside of that band and some tribute ensembles after Frank's death. He sang Joe's part on Joe's Garage.
His 4-pc band performed in my town 8-10 years ago, a program of FZ songs. Was a fun show, the man can play guitar. I got to meet him after the show, seems like a nice cat. He was headed to St Louis to visit family.
I met Ike at a local tribute act (the most excellent Stinkfoot Orchestra) performance a year ago August and talked to him for about 15 minutes (about Frank of course). Nice guy. I also saw him play with them earlier this year. I don't think his health is very good to be honest. I wish him the best. Still remember the first time I heard him on Joe's Garage.