Sometimes it's tough to know how much a character should gain if they train for a level in one of their superpowers.  Recently our resident Magic user trained with Plant Control, and - being as that power is especially wimpy - I gave him a bonus of +2 to hit with all plants as well as doubling the number of Hit Points worth of plants that could be controlled.

My PC Compass trained for a level with his Magnetic Powers, but I don't know what specifically that did for him.  Should he be able to grab ferrous items with movement only (instead of an action)?  Should his Magnetic Capacity be increased?  Should his accuracy with Magnetic Control be improved?

Any ideas that you might have would be appreciated!   

That's not a bad idea, but it doesn't give him much (unless you do a huge increase).  I certainly don't want training in superpowers to do too much, but I want it to be something worthwhile (interesting, unique, etc.).

One of the most annoying things for magnetic characters (and telekinetics and others like them) with 2.0/2.1 is the fact that it takes them one action to grab an object (even if it takes up 1/1,000th of their Capacity), then another to hurl it at someone/something as an attack.

I doubt that this would be true for a master, experienced character (like Magneto).

But then that might be too much...

I agree on the 3.0 comment.

Cougar recently allowed my character to reduce the PR of his Teleport as a level advancement. It's only usable at a greatly reduced range (called a combat teleport) but takes the PR cost from 6 to 2.

I think a +2 accuracy increase or maybe a -2 to be hit on the combat chart (where magnetic defense is applicable) might be a nice improvement for your character)