I do. He uses it with and without me, but I am no more scared he would use it instead of me than he is of me using my vibrators instead of him. I have never been insecure about my SO masturbating...we still have plenty of sex and his hand is not as good as my...
I have but he tells me he isn't crazy about them. He said they are 'okay'. I think he just hates the upkeep required for the more expensive toys like Tenga and Fleshlight . He likes the c-rings we use when together and the We-Vibe 2.
I bought her all kinds of toys years ago(pocket vibes, dildos, waterproof G-spot vibes and a rabbit). She used one of them regularly but would never admit it or let me watch. I tried using them on her while we had sex but she didn't like it. They got more used from me on my own than they ever did her.
Then she stopped when we started having kids and after years of them only getting used by me, I chucked them and bought my own toys just for me.