Also, I'd like to just recount a bit from my two 25C experiences:
The first was nasal (375 ug) and it burned as fuck (40% vodka, yuck. 0,15mL in each nostril). Effects came on rapidly and it was very visual and nice, but it sort of tapered off extremely quickly, visually. Left me in a sort of nice mellow mood for the rest of the evening.
The second was 750 ug sublingual. Effects come full on within 40 minutes, and again it was rather spectacularly beautiful visually. However, the visual effects receded disappointingly fast, at which point I followed it up with 33 mg MXE sublingually. This picked it up somewhat, even if I was still very sober (and according to my flatmate, much more enjoyable to be around than when I did my first 6-APB trial - he was gaming on both occurrences and I wouldn't stop talking to him).