Dan Clark said:
what's different about the bases and attachements?
OK, well the OFK700 comes with ONE base plate, which can be used in TWO ways:
Firstly, for horizontal use, with the add-on bearing bit:
[attachimg=1]
Secondly, for vertical use, but again with the attached bearing:
[attachimg=2]
When used in the first way, the router bit is at 0 degrees to the horizontal, and in the second, at 90 deg to the horizontal. Not included with the set, but as an accessory, is an additional base with 1.5 degree offset, making the bit 1.5 deg off horizontal (Are you with me so far? I'm not terribly good at verbal description!).
The MFT700 on the other hand, has TWO bases. The first is a 1.5 degree offset base for (near) horizontal use:
[attachimg=3]
This may even be the exact same base as the accessory base described above, but I'm not 100% sure on that.
The second base is for use in the vertical mode:
[attachimg=4]
The main differences between this and the OFK in vertical mode is that 1) the base goes all the way around the axis of the bit, and 2) an edge guide can be fitted (which is included in the set).
It would seem to me that the OFK would be very awkward, if not impossible, to use with bearing-guided bits, whereas the MFK looks ideal for that purpose.
In a nutshell, I think that the MFK700 is basically an 'improved version' of the OFK700, but the differences between the two were great enough to warrant a new part number, rather than simply a 'revision' to the old one.
Please note however, that ALL of the above is based on nothing more than a brief look at both models, and reading on't'internet. I haven't actually USED either of them!!! ;D