Hi Robert,
The early Meade mirrors were a lottery, sometimes the mirror would be top class, whilst other times a real lemon.
Unless you have a particular mirror avialble to you to be tested before purchase, you're better off buying one of the new crop of Guan Sheng Mirrors (used in the Lightbridge) of the size needed.
Or if you can stretch the budget further, go for one of Mark Suchting's mirrors, made here in Sydney, these are "hand made"