Hi Paul there is nothing to thank for, you are always welcome. The best advice you can hear there is- go for audiotion in home.If this is not posible I will try to direct to some basic thing you may expect, alsi this may help other Audiogon members as well.
Diferencies. The problem is that in High-end audio there is no strict line betwwen big and small diferencies. One man's small is another man's huge. There is people who claim/hear huge diferencies between two furutech sockets made from the same material. I hear only subtile (if any) diferencies on things like this. Diablo still have Focal school sound- fast,transparent and very detailed and sometimes(with wrong recording or equipment) agressive. But I wouldnt call it sucessor to Micro Be-they are quite diferent. Its not like say.. watt puppy 7vs 8 sonic diferencies(where diferencies between these two I hear difers only in tonality, not primary speaker signature) I heard Diablo with some diferent gear(with my CD records) in 3 diferent places-
1)in my home they sounded best with pass labs xa amplification/Sonic frontiers DAC and Zendo cables- sound was balanced- no forward or laidback, quite "thick"(="fat") with lot of "bloom" in midrange and agressive only in very bad records.Bass tighness, details and "air around intruments" was not best from what diablo is capable but system had some musicality and involvement in sound which hapens rare on focal utopia speakers(IMHO).
2)at dealer show -with very expensive top of the line Ayre/esoteric/ and all nordost valhall'as cabling.(~200 000EUR) - dynamic, transparent ,fast and VERY detailed sound, resoliuton was very good. There can be heard some harshness on trasients on some claiscal works but nothing to worry about too much.
3)at friend's home with mid-to top Ayre /esoteric combo but also with Nordost Valhala cabling (again more expensive than speakers itself) inspite room acoustic problem and speaker placement(far from ideal) system sounded very good , maybe with slight excesive lower midrange which added some "liquidity" and "sweetness" to sound.
Some basic Diablo signature I noticed in all enviroments-
1)Big soundstage both in height and witdh- diablo sounds "bigger" than some floortanders and bigger than Micro for sure.
2) Detailed, open and fast midrange
3)very top end(15-18khz) lacked some energy in big clasical works. this was less noticebale with Nordost Valhalas and Zendo cables(zendo are not so fast as nordost but also transparent while smoother in mids) I would not consider this as flaw as its depends on mucic and speakers you are comparing. The same Sonus faber Auditor M have tons of "air" and are perhaps more enjoyable on clasical works like wind bands but unnatural in vocals(where Diablo is very natural and life-like)
Micro Be have the same tonality in this region ,if you like it, Diablo would not be problem as well. I felt Micro Be is more "right" speaker , while Diablo being slight "off" in exact tonal balance buts Diablo timbre is more enjoyable and "more interesting" to listener- less boring, more exciting.
drawback with Diablo IMHO is that being monitor it does not provide what small speakers should-
1) does not work with small(=cheap) components- I played with cheaper(with is small enoght to place in my bedroom where Diablo was instaled) amplification and I could not live hearing how much music I am missing. Diablo deserve amplification,sources and even cables which is more expensive than itself.
2) require some space from back walls and sounds best when took out of side/back walls quite much.
3) not so cheap (but not so expensive as magico Mini II either)
I did not understand what you mean by saying "Diablo sounded like electrostats" however. The only thing which comes to mind than diablo could smoothly extended in high frequencies and highs are not discract from whole image (like quad's do) and have some speed as well.
hope this helps