SPD pedal trouble!

Hey everyone,
I have some Shimano SPD pedals (PD-M540/M520 not sure which) They have been a great set of pedals however recently they have been quite "sticky" while trying to unclip. I've tried putting lube on the springs etc to loosen them up but it doesnt seem to have helped. Has anyone got any ideas how I could get them back to how they were where it was easier to unclip or does it sound like new pedals will be needed?
I have some Shimano SPD pedals (PD-M540/M520 not sure which) They have been a great set of pedals however recently they have been quite "sticky" while trying to unclip. I've tried putting lube on the springs etc to loosen them up but it doesnt seem to have helped. Has anyone got any ideas how I could get them back to how they were where it was easier to unclip or does it sound like new pedals will be needed?
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cleats are OK?
The cleats have done quite a few miles, how would I be able to tell if they were worn?
BTW don't be tempted to remove the springs you will never see them again
Also quite like the look of CB eggbeaters, what are peoples thoughts on them Vs XT ones? and are XT worth the extra?!
+ some other bikes.
I really like Shimano - others don't. THe 540s even though older (than the 780s) are pretty similar in weight and about £15 pounds less..... Just need to workout how much you'd like to spend.
I'm happy to spend the extra if its worth it. However if there isn't a huge difference then I wonder whether its worth it...
I really like Shimano as well but having never tried CB ones before I wonder if its worth giving them a go.