I've been using this for 2 weeks, every other day or so. Total 8 times. Dosages ranging from 5mg to 10mg. I've been feeling great. I got loads of motivation and creativity, and this just got me a new job!
No noticeable negative effects. Mind still very sharp and no signs of mania*. I have not felt any tolerance or change in effects.
Music enhancement is still great and dancing is amazing! It makes me very talkative and anxiety goes completely away.
The next day after dosing is good, but with not with an afterglow as strong as MXE. (the only other disso I'm experienced with)
Now at different dosages, it's a very different drug. I've tried it once in a 16mg dosage and I found it to be much more dissociative.
On the mind, it's much more disorientating instead of enhancing. The dissociation is still pretty mild, but you get the characteristic hole-y feelings of feeling your body shift and having mild CEVs when laying in bed, which are not present at low doses. With this dosage, on the next day there definitely was some irritability, so I probaly won't be doing it again.
Now with a 8-5 job, I won't be able to dose it very often, so I'm going to keep using it only 1 or 2 times a week.
Overall, when used sparingly in the correct dosages, this is pretty much a perfect substance.
* I would definitely avoid doing using it 2 days in a row. At least for me, it brings noticeable mania, which seems to go away the next day.
While using it every other day give absolutely no problems to me. YMMV.