I have also known Arminian Baptists who have attended Calvinistic Baptist churches and immediately embraced Calvinism--because they notice that the message is an order of magnitude more energetic, more earnest, more powerful.
(In a single year of the Calvinistic Great Awakening, more than 50,000 people were converted to Christ! This tells me that as much as I like Billy Graham, we don't really need more men like him. Gosh, when Dr. Graham gives his invitations, he always quotes John 6:37b--never mentioning 6:37a. Something is wrong here!)
Actually, I think we need men who know what the gospel is and can preach it. So far as I've seen it is really lost in the Arminian churches.
The book I'm reading by a Methodist-Episcopalian Stanley Jones is not so good for it's doctrine as it is for it's presentation of the gospel message itself. For instance, Jones talks about the TOTAL surrender of self to Christ, but he doesn't explain what is required for that to happen. He just says, if you will surrender yourself completely, then these are the benefits of losing yourself in Christ.