Joey;
I have a MPC3000. It's a monster. I love it and have used it for about 5 years. I understand what your friend is saying. But, unless you have some deep seated reason to go for the vintage unit, I suggest that you go with a more recent product. There are more supports in place for the 4000 than the 3000. It's just that simple.
If I were going to buy a MPC now, I'd probably go for the 2000XL. But that's me. The 4000 can be a little more work to grasp, but it's an amazing product and well worth the cost. Go for the easier choice and save yourself some drama later.
Peace.