So how many people are using subwoofers

No contest, get the REL. You have no idea how much you're missing, and any amount of words we can say here won't even begin to describe the improvement you are in for. The only people who aren't gaga over RELs are those who haven't gotten them yet or who haven't bothered to spend the time to get them broken in and tuned properly (both of which take a long time). Suggestions: 1. get the biggest REL ST series you can afford, the performance goes up dramatically with each and every step up. For me, one Stadium is the minimum. 2. On a performance per dollar basis, get one bigger one rather than two smaller ones. In other words, one Stadium will significantly outperform two Stratas if you can find a location for it that gives a smooth room loading. Of course, on an absolute basis, two is better. 3. Set the crossover point a LOT lower than you think you should, typically by half an octave or more. If your speakers are good to 45 Hz, start the sub at around 30 Hz (!) and play with it from there. Good listening!