Whilst I can echo dartagnan's comments you do have to heed what others have said.
Firstly the Jetlinx course is first rate and great fun. I went on the A320 with a guy who had already completed the Oxford MCC (he wanted some JOT on the A320 as he had a job lined up with BMI). He told me first hand that in his opinion the Jetlinx course was far superior to the Oxford one. You cannot ignore the fact that these pilots are current BA and Monarch line pilots, they are using level D sims, they use a set of SOP's which are very close to real world operations and they treat a number of the sessions as LOFT exercises.
The price is £3650 so it's not that much more expensive than far inferior courses. (and it's a hell of a lot cheaper than virtual aviation’s £2000 for 4 hours sim time). Secondly there are a number people who have taken cheaper courses and then paid Jetlinx for sim practice/JOT training working out more expensive in the long run.
However
As has been said don't expect it to help you with sim selection because using the A320 will not help at all. Firstly the A320 has autotrim, and a completely glass cockpit and unless you get a sim check on an A320 it will be of no benefit whatsoever. Secondly, you do very little hands on flying in the MCC course. The flight directors will be on throughout, you'll put the autopilot in almost as soon as you've cleaned up and you won't take it out until established on the glide. If time permits you'll get to do a bit more hands on flying, possibly with raw data but only when the course content has been completed.
In summary I'd recommend the Jetlinx course to anyone, and if you want some JOT practice do it on the 757 rather than the A320 as the 757 is much closer to the sort of thing you'll have a sim check on, but do not just do it to practice for a sim check, do it because it’s a great experience and a superb way to finish off your training.