i was also looking for a canister for my 12g Long recently. i went back and forth and read as many reviews as i could on the fluval, eheim and marineland brands, even looked on youtube.
bottom line is, they all are good products. there will be both good and bad experiences across all brands. i ended up going with an eheim 2213, its been up and running for almost two weeks now, it is very quiet and provides very nice flow and very clean water.