Are they tuned for the mass of your speakers? they need to be so either they are or you just got lucky. For stability, I like the wider footprint of the Townshends that i use. but if you can get away with it, the smaller footprint you have with one under each corner is cleaner.
Edit to add: i love mine too, they both do the same thing. to be clear, I am not recommnding Townshends over these, I have never compared. I would expect them to be very similar.