R there Any reviews of the 4 major micro inverters comparing effciency,ease of install?

Enphase
Siemens
Enecsys and soon to come
SMA
http://www.renewableenergyworld.com/rea/blog/post/2012/08/sma-microinverter-coming-soon

are there any reviews comparing these 4 microinverters? which is best and why?

Are there any other companies coming out with micro inverters?

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