True, but it still is very good. It still reaches far though. Some clients go up to 6.0. Iridium goes to 5.5 (Which is pretty good). Although, it gets hits on people pretty good. And the speed is good, too. Iridium is a very good PvP client to use. (Especially on PvPFest).
To fly fast you are going to need to hack and have access to the /fly command. If you are going to hack I suggest you get iridium or resilience.