for me is the best one also... it matches oem for calibration from ford i tried it many times on oem mustang and the afr is exact of what the oem tune sais.
I have not seen the compressor map but i doubt that a such a small compressor and turbine wheel will make 1000+ whp with a good average power curve and spin 7000 rpms the engine, i hope Dillion can do it so i can be wrong and never buy other turbo then Comp!
Any ways i don't want to change...
I use vr1 and some mild wot runs and works great i use now modmax stainless rings they seat easier and work great and bit cheaper many engine builders use them because they are flatter and smoother than total seals AP...
i always use now pac springs since they use the stock retainer it weights almost like comp titanium retainer thats why i like the stock ones because is light and save $400+