Satin Impervo original formula was product #235. BM then came out with C235, which was downgraded and doesn't dry as smoothly. Then they came out with Z235, which is similar to exterior stain. The brush strokes don't settle and the sheen is poor. I've also had trouble with it just falling off of cast iron radiators. Meanwhile, BM has also been coming out with their "waterborne" line of water-base paints, which cover well but go on too thin to produce a consistent sheen.
In addition to the BM product changes, the company has been very aggressive about pushing their products into paint stores. Store owners have told me that BM doesn't allow them to have a BM account if they sell paint from competing companies. The result is that nearly every paint store I know of sells Benjamin Moore and little else. For some reason BM puts up with California, but other brands seem to be disappearing. (One store told me that BM forced them to discontiue Cabots stains. Another store told me they had to keep the Cabot's in the back.)
I can't continue to use BM paint. It just isn't good enough anymore. I've been switching to Pratt and Lambert, especially for interior oil. I like their Red Seal product. But I also like their other products that I've tried. Unfortunately, it's a long trip for me (even in a big city) to get PL paint.
Sorry to be so long-winded, but I wanted to describe my experience to see how it compares to others' experience. I'd be interested to hear any thoughts about paint brand experiences in high-end residential work, especially where satin oil has been used for interior trim.