If you're familiar with SFP transceivers, then you would definitely know its advantages and disadvantages. It's rather quite easy to actually learn why many people prefer using it.
So promising is the SFP+, some people believe it will eventually supplant the XFP in 10-GbE applications.
GBICs have been around for 10 years, and they are still shipping. XFPs have been around for seven or eight years, and they are the mini gbic sfp popular one now for 1 gig. But you are going to see a trend from XENPAK, now the most popular, to X2, and the question is with XFP and SFP+, how do they line up with each other?