If you're talking about the directional thumbpad, the MX-850 would most likely solve that issue. The center button is separated from the rest of the directional buttons, making it very difficult to "slip".
As OTAHD mentioned, you can also use the same program you already have on your MX-700, if you are comfortable with the way it is working.
If you would like a free consultation, you are welcome to call.
Thank you,
Damon DG
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