The Pro Classic (Lambda Spirit in Japan and some other names in different markets) was the first "budget" Lambda and precursor to the L300 we have today. The new Lambdas will give you some improvements but over all it is just different and not a major step forward.
So he "improved" the design by taking out all the CCS stuff in the front end and replaced it with some resistors... which are way inferior...
Yup...plus a shitty tube based PSU and I'm sure this is brilliant!!
OK, fired up the BHSE for the first time in months and listened to this new Tool album quite loud and my conclusion was I should get back into this headphone shit.