I think a substantial subset of Logos Greek scholars and students would snap up a FULL version of Kurt Aland's Synopsis Quattuor Evangeliorum. By "full" I mean containing material and functionality absent from the SESB version:
- alignment of the parallels (as attempted in Throckmorton's Gospel Parallels)
- ability to highlight the text
- ability to double click on a word to reach one's preferred lexicon
- inclusion of the non-canonical parallels
- inclusion of the textual apparatus