The Losi and OLDER Xray are both "edgy." (When a top level pro driver tells me it's too hard to drive, I believe them.) New Xray (EC or something like that) looks more stable though... and to agree with what everyone says, there is NOTHING else built to the quality standards of Xray.
Jammin, MBX5R and Kyosho are more "friendly." Also check out the Caster ZX-1R pro. Very similar to the Mugen, but lighter and less pricey, and turns better. I have an MBX5 Prospec, and believe me, it takes some work to make it turn halfway decent. I'm changing to the Caster ZX-1R pro.