Congrats!
They really are great pieces of kit. I had a PS 100 first, after I got my 72 Marshall but I didn't care for the tone 'squish' it did. This was 7 years ago, maybe the 100 is different now. I did though try the PS2a recently, and it does a great job with my 68 (72 is now modded). No strange 'squish' to the tone like the 100 did a while back.