I have been using the spot mode meter in my 5DMkII when using my Sinar f2.
Works okay, as I that is how I use my (D)SLRs 99% of the time,
and am comfortable with the spot mode selections, and know how to compensate when needed.
Anywho, I recently purchased a handheld unit at a really small price, a Minolta IVF, with spot attachment.
I downloaded the manual from the brutus site, and have played w/ it somewhat, haven't made any comparisons, yet.
What I really would like is to input aperture and iso information, however, it appears this unit, probably others as well?,
only allow data inputs of shutter speed and iso.
Any meters that allow input of aperture and iso, to calculate the shutter speed needed ?