Someone mentioned Satan's lasers had trouble getting qualified, well that problem is now resolved for spx, remember, this is for legacy product, therefore they must be really cheap and run high volume, the lumentum DML and EML lasers are for the upcoming 400g-3.2T products as well as the plus one which we're all waiting for (see Lisa Thompson's Zacks report for verification). Thats where we can be compelling to tier one customers because the Lumentum lasers are already qualified and they have a "Toyota" like reputation for durability. 

IMO