Welcome to the forums.
If you have not read
the review of the R25 on TabletPCReviews then you might be interested in this statement:
For many years the Tecras stood as a faster, sturdier and more secure business notebooks compared to the Satellite line. But now both models overall and security specs are practically identical offering magnesium alloy casework, spill resistant keyboard, shock protected design including the HDD and even a fingerprint reader. The only major difference is a TPM module in the M7 and two customizable application launch buttons instead of media buttons.
Linda from
TabletPC2 reviewed the Tecra M7 and this should give you a contrast.
Hope this helps.