I had a "chip" on my old 3.0 elite and it was rather good.

I had mine off Mtekperformance (he's a member here) and although it cost quite a bit more, £135ish, it was matched exactly to my ecu so I knew I was getting the correct mapping.
Also I knew the chip was from Collins Power Engineering who are very well known and respected for their products in this field.
Customer service was excellent too.
Oh, and I'll be fitting another one to my current elite (and probably the MV6

) within the next few weeks.

However saying all that, gpb seems happy enough with his, and nothing bad has happened yet.