And it depends on what you want out of the charger as well.
The Accu-Cyle Elite as Da Rock points out is without a doubt a great charger for us Nitro guys that have Nicad or NiMH battery packs. It does fall a bit short in the Lipo catagory.
I do have an Accu-Cycle myself and use it regularly but I also have an E-Station charger that balance charges up to 5 cell lipo (Accu-cycle will not balance charge, it requires a seperate balancer) along with that it will charge NiCad, NiMH and my gell cell field box battery.
Its drawbacks are it will only charge one battery at a time and runs only on DC. I use a power supply at home. It does make a great field charger.
http://www.bantam301.20m.com/BC-5.htm
OH PS; as for Hyperion. I am not familiar with thier chargers but have used thier LiteStorm lipo batteries and am very happy with them.