I use one of these, it works great for programming
27XXX,27CXXX, FLASH,
and some uCs.
I'd had a couple of these as well. As Brain said, also works great for
me for flash and a number of 27x devices. Only thing I've seen is that
they (at least the 2 I've used) tend to be finicky with smaller chips
like 2764 and 2732. They seemed to like certain brands (e.g. Intel)
better than others. That being said, the newer models may be better.
To combat the small chip issues, I later snapped up a Pocket Programmer
that works great with those and some of the more obscure old chips, and
I break out the Willem for flash stuff.
James