I see the attraction. However, the FL102 with focal reducer has a FL of ~640mm, vs the DED of 540mm. So from an image scale and FOV perspective they are very similar.
A quick google around also suggests that collimation of the 4-element design was problematic, and a star test prior to purchase would be advisable. (However if you get Vixen to clean the optics they would re-collimate it as well). If collimation is potentially a problem with the DED, then compared with your FL102S which you know has perfect collimation and outstanding colour correction, i still reckon you're better just sticking with your current fluorite frac.
The main attraction as I understand it of the DED would be the enormous corrected image circle. Again, unless you're looking at getting a KAF16803 is an image circle that large necessary?
Personally, i reckon you'd be better off getting a second mount instead of the DED, then you can run your FL102S and your new VC200L in tandem on separate targets and double your image output...
