i've tried legal herbal pills before, but there are so many types so they probably weren't the same as the ones you have found. to be honest i was already on other things when i tried them so it'd be hard for me to give you my account lol.
i remember them being a little bit 'trippy', ie you may experience hallucinations on them, or colours might appear more vibrant, stuff like that. but to be honest they make you feel a bit too weird for them to be a 'party drug'. i certainly wouldn't want to take them in a club. most people i know felt a bit sick after taking them. many people said they did nothing. a friend who took some particularly strong herbals pills reported a really good trip, but the worst comedown he has ever experienced the next day.
basically, they are all different, and you can't be sure what's in them. the ingredients list on the back of a pack i had just had a list of abbreviations which didn't make any sense! as for being like ecstacy, i wouldn't agree. even if you do have a good time on them, they are still just two totally different things.