I think they are really nice monitors - certainly they are constrained by their size, but I would put them in the same league as the better known JBL LSR 305.
For reference, I use four different monitor pairs:
1) JBL LSR 305 - they have a sound, lots of people like that sound, which makes it "audibly portable". If these were the only monitors I had I'd add a sub-woofer.
2) Presonus Sceptre 6 - the most recent addition to the pile, and I really like them a lot. They are a co-axial design, which is my preference because they provide a more stable and defined stereo image, and they are little less prone to suffering from room problems (to a point). I'm considering adding a sub-woofer because they don't go quite low enough for media production work.
3) Urei 809 - my dinosaurs, I've had them since the 1980s, and I know them well. They have a very "rock and roll" attitude, and they don't need to stinkin sub-woofer.
4) TOA RS-21 "cubes" - my version of the infamous Auratone cube, mostly because I got a good deal on them. They work nicely as a sanity check.
If I did not have the LSR 305s I'd probably have the Eris.