LGI Halo 25 is legit, but Halo IMO should be run for 6 weeks and ends up being more expensive than helladrol if you buy enough to run it long enough to completely see it's benefits. If running a halo clone, Helladrol and the 180 pill bottle is where it's at (especially if you can get it on sale or with a coupon code somewhere). Even if you get halo-25 for $25/bottle, it's still running you $75 for the same amount of pills you get from mrsupps for $69.99.
They're not the only option, but you know what you're getting from them.