Yes ive tried it, and yes it is a legal form of speed, mind you i tried it about 7 years ago now, the ingredients could have changed.
Yes i lost weight, 7kg in the month, however my mood swings were terrible, up, down, up, down, even i couldnt handle it let alone those i lived with.
about a week after i started taking it i couldnt sleep, i didnt need to sleep, i could survive easily on 3hrs max, i had no appetite, i had to force myself to eat anything.
the only actual good thing was that i had more energy, but it was obviously fake energy.
It took a long long time afterwards for me to get back to any normalcy, as in sleeping, mood swings and eating, but the weight was back on in 8 weeks, even though i wasnt eating that much.
my family went nuts at me when they realised what id been on.
thats just my experience with it.