bond
Just recently did the assessment... had a good experience. Didn't seem like a scam to me. According to the instructor I did it with, bond actually loses money in the JOT course they offer you in case the assessment is not up to standard hoping that after it you actually buy the type rating. In any case, most people do pass the assessment and can get directly on a TR course. The £300 you pay for the assessment is then deducted from the TR expenses.
Keep in mind they do make point in saying that either line training or a job at the end of course is not guaranteed and that some people who completed the 737 course have had "bad experiences".
Alex.