Anyone used NLP engines?

[Coyote]

Hi - a big end has just gone on my E4, so I've used various part search sites to get a new one. I've been contacted by NLP Engines, who have offered a good price on a E5 and E6 engine. But before I splash out teh money I wondered if anyone here has had an engine from them - any comments good or bad would be helpful - thanks.