I had mine converted to 720. Very happy with it. In good light, sunny, I get high shutter speeds at moderate apertures. I did not want to cock around with filters. I generally use the Panasonic 14-45 kit lens which is very sharp. The other conversions give you the strange false colors of which I am not interested. I only wanted BW. The conversion came with a custom color balance which helps. I keep the camera in a small bag in the car so it is always available.
It took some experimentation to get the processing nailed down. First LR to get a rather flat full toned image and set the noise reduction to about 60 (further processing increases noise drastically, best to nip in bud). Then to PS and the Silver Effects Pro 2 plug in. I have a couple of pretty good presets that I developed which speed things up. This adds the contrast, pop, and toning. Back to PS where I play around: maybe mask the sky in Topaz Remask 3 to darken the sky, use luminosity masks to tone down the highlights, maybe some local noise reduction using Noiseware, and general tonal manipulations.
I have had a recent revelation, an eye opener. I have gone to the Ansel Adams exhibit in Peoria, Il a couple of times now. I noticed how Ansel handled the highlights. They were generally not as bright as I thought they would be. They were more muted and had much more tone in this zone than I had been using, due to the roll of the film curve at the top. I was pushing the highlights trying to get more 'pop', a mistake as I could now see. So I have adjusted my processing in an attempt to get more meat in the highlights.
Since I have backups of backups it was no problem for me to do the conversion. I still have another G1 and GH2 that I could convert.
Larry