Same here with the mn12performance parts - some of the cheap 'solid' mounts are not really solid. Others have had problems with cheap mounts.
Spend the money to get good parts, the job is a real PITA so you don't want to do it over.
BTW: If your mounts are really shot like mine were, you'll have a new feel to the car after, lots of creaks and groans go away.
Aaron