Probably done it 7-8 times. Most I've ever taken was 3 tabs..that was intense lol. Walls changing colour and moving in/out/up/down, almost like they were breathing. Best dose (imo) is one tab...get the acid feel without being too fucked. All in all, you'll laugh, music sounds awesome and you just feel happy and love nature.
The trips themselves are usually great fun (assuming everything goes smooth). The most important thing is set and setting. Be somewhere you feel comfortable with people you feel comfortable with...cant stress this enough. The only issue for me is the come down. Mentally exausted but I find it really difficult to sleep for atleast 14-15 hours after a dose.