First of all any type of Dynaudio speaker has always sounded good too great too me, anytime I have had an issue with them sounding like crap, some thing was usually wrong with them. Example the Xeo 2, right out of the box they sounded bright a few days later they quit working and I sent them back and they sent me a new pair and we where in business again. But to me, they just didn't cut it and I gave them a few months and about 300 hours and just never thought they where up to speed to my liking. I always hear the word better used on forums, but it should be re-phrased to "Better for Me" or different. I had Dynaudio in the past that just didn't sound good to my "Ears" Contour 3.0 and Contour 2.8, no bass.. Great highs but no lows. The Contour 20 is a monitor that is most like my C2 Platinums, which I love and right out of the box they sounded decent to my ears, mine right now are only being broken in with a NAD M10 which is pretty darn good, and I could easily see myself living with this system down the road in a much smaller home and or condo, which is about 10 years off. 50 now, and thankfully my hearing is darn good, I just know when to turn it off like this morning when wife wakes up yelling about everything she can't control. LOL
Hence it's why I am in the basement listening to music in a sound proof room!
I would first off stick with what you like, some times switching isn't always the best thing to do, if you loved the 260 so much and they are a mighty fine speaker, I would have had them side by side for a few weeks and or a months before I would committed to sell them off. Some times you know right away other times it takes quite awhile to make that determination. I only had the S40 and Contour 20s next to each other for a few days, but that's all it took for me before I knew what I wanted. Bass was tighter, and more defined and highs are better on the Contour 20s than the S40, but the S40 was equally as good with the exceptions mentioned and better for a smaller space. Some times you just have the urge to change and some times when you take that leap, your not always pleased with the out come. In this case for me, I am extremely pleased as the Contour 20 is the closet monitor to my Confidence C2, even more so than the 3 pairs of C1's I have had over the years. Some speakers like I said take much longer during that break in phase, some you will notice right away, anytime I change I try to keep both pairs around to compare before I sell a pair off, I might do this will the Confidence 20 down the road, but that could be a few more years, so I will definitely enjoy these for now.
I should note going from a good floor stander to a monitor can be pretty drastic at times, the stands that Dynaudio makes, sure makes them sound more like floor standers, I did initially put them on a pair of other stands and they didn't sound as good, but that changed when I used their stands.
The Dynaudio speakers I have had that I didn't keep long where, and it wasn't because I didn't like them, I just didn't like them as much as they where different, to what I was use too.
1.) Contour 2.8s
2.) Contour t2.5
3.) Contour 3.0
Any of the DM series, just got too used to Contour and above they never sounded as good and the same went for the Excite series for "Me"
Usually I take any reviews with a grain of salt, and some times I agree with them, other times I am like "What the Hell Were They Thinking!" in the case of the new Contour 20's to me they are spot on:
My suggestion is if you're moving and you get a chance to build your own room, then build it to make anything sound good. Aaron "Border Dog" suggested this before to me, and another sound Engineer at ETC I know and its the best thing I have ever done.