I've tried both 5 and 6 on several occasions and have tried them both together once. Not sure I agree with Frequent Flyer.
Euphoria:5APB - 4. Euphoria is there but the whole experience is much more lucid and functional than MDMA. 6APB - 7. Much more euphoric. Really lovely feeling - particularly with doses of 6APB above the 100mg range.
Stimulation: 5APB - 8. This is where I don't agree regarding sedation. This stuff gave me so much energy, a wonderful clean feeling. Was at a club night for 8 hours, had 70mg of 5APB to begin with a small top-up (30mg) after a couple of hours. Going all night, lots of dancing. 6-APB is so much heavier. Wouldn't want to rate it. However, I have not tried it in a club - I'm going to this weekend. I'm hoping that, mixed with 5APB, it is going to be a lot of fun.
Empathy: 5APB - same with euphoria. It is there but 5APB was all about energy and lucidity. I wanted to talk to people, interact, kiss my girlfriend etc but I was perfectly happy just dancing and enjoying the feeling. 6APB - 8. Very close to MDMA at a dose of 150mg - nothing beats MDMA - but very close. In fact, the empathy I experienced during my last little experiment with 6APB allowed me to make a major breakthrough with regards to the thesis I am writing.
Tactile Sensation: 5-APB - 5, 6-APB - 6. Both quite similar. The functionality and lucidity of 5APB leaves it a little wanting in comparison to 6APB.
Visuals: 5APB - eye wobbles, nothing more. 6APB - OEVs, CEVs, light, colour enhancement. Probably about 3 out of 10. However, mixed with weed and MXE, 6APB gets very, very, very trippy - be careful not to take MXE too close to the peak. With that combo 6APB comes up to a 6.
Music Enhancement: Both excellent, nearly up there with MDMA.
On the occasion I tried 5 and 6 together, it was very apparent that the former is so much more potent than the latter. You need much less 5APB to roll than you do with the 6. 50mg of 5APB totally overpowered about 150mg of 6APB.
However, I bloody love 5APB for a couple of reasons. It is clean, crisp and bursting with energy. It has enough empathetic and euphoric qualities to make socialising (in a club seating) both easy and enjoyable. In addition, I have not had any comedown after taking 5APB. I don't really think you get any with 6APB either.
The plan for this weekend is to start with 100mg of 5APB (which I wouldn't recommend unless you've tried this stuff before) and then to top up with 80mg of 6APB. My hope is that I'll have the energy and drive from the 5APB coupled with some enhanced visuals from the 6APB. As ever, a trip report will follow sometime next week.