I think Megablocks and BestLock and other knock-off brands are lousy. Once, I got a Best Lock fire truck set...and the bricks were of such poor quality they wouldn't even lock together, and I was unable to finish it. I will, however, use their figures and accessories from time to time, as they are more detailed than Lego figures (sometimes, anyway).

As for custom lego accessories and such, I am fine with using brickarms weapons (though not often because of the price), as long as it is necessary. For example, say I need a shotgun. Brickarms has a shotgun that you can recognize as a shotgun. However, If I need a knife, I use a Lego knife, instead of Brickarms, because it is not necessary to get an extremely detailed(and pricey) Brickarms knife. I do paint over Lego accessories from time to time (hats, swords, etc.), but usually only if I have them in large quantity and don't need 50 in the same color. I don't like breaking Lego, as it pains me to do so and I am afraid it will look bad, but I have done it once or twice. Usually, though, my altered Lego come from an accident, like me sitting on one by mistake, so I will use those.:P

Indeed, it has been removed, which really bums me out, because I only recently discovered his channel, and instantly became a huge fan of the "Pilgrims" series, so when I finished "Pilgrim's Son" part 1, and saw that part 2 had been taken down, I was all like, "NO! Now I'll never know how the most epic brickfilm series about pilgrims ends!" I really hope he returns and re-uploads it: his videos are awesome!