Hi Rudge. Not sure I will be able to do a meaningful comparison since I have not had any of those preamps in my system for quite some while, even the Joule is at least six months or longer. I will be A/B the Lightspeed Attenuator with the Mapletree, I can only say that I prefered the LSA to the Joule which had been my favourite tube preamp (over the CAT, ARC, and Lamm). I will say that for $800 (I got the blackgate capacitor option)this is one heck of a good sounding preamp in my system (using EMM Labs, Music Reference RM9 Special Edition amp, and Merlin VSMs. So my opnion is that for $800 you can buy one heck of a fine preamp that plays very well with much higher $$$ components - this preamp is good on any scale, but simply tremendous value and lets audiophile with limited budgets buy into true high-end gear without the prices some think you need to pay.