I bought a few of these for my friends and I and they are very good, especially for the money.
Initial impressions are WOW with even better trades than a TM one as we compared them side by side. In fact where the TM says made by Tokyo Marui, the Bell version has property of united states on it!
the finish doesn't look as robust as the TM version and I can already see some wear on my one where it contacts the plastic serpa holster I use. Weight wise, it is good with the mag in and okay without.
The mags, do not fit in TM guns or WE colts, but the TM mags will fit and work in this one. The supplied magazine with all three of the ones I had were tight fits but I imagine this will loosen up with time.
When I used mine it was about 2 degrees C so it suffered horrendously from cooldown and often failed to lock the slide back or even discharge a complete mag it would often vent all it's gas skywards throught the ejector port. Now it is warmer, approx 13.5 degrees it works MUCH better with a crisp recoil and no venting of gas so in the summer I hope it will be even better. I do not have chrono results as yet as I will wait for it to get warmer.
Overall, an excellent piece and although I don't even like colts per se, I am convinced and will be ordering another one for dual weilding purposes!!!