They give you some more flexibility I guess. I'm the second owner of mine and it came with the depth, Haynes, scoop & half power mods. I never use any of them, if something happened to it I would replace it with a stock one. I've never done a side-by-side to compare my modded one with stock, but I don't think you would see a radical difference between them with the mods bypassed/defeated.
When I first got mine I was running it with 2 tubes pulled through a GB loaded 1936 cab.
I thought it really needed the depth Mod so I took it over to Mike.
For sure gave it a lot more bottom end with this set up.
Now I have (2) Soldano 2x12 cabs running the full 100 watts and have the depth mod completly off and the Bass on 3.
Any more and it is just too much.
So I would say overall no need for the depth mod unless your playing through a small cab.
The scoop mod is great if you wanna play clean.
The depth mod is a must for high gain tones IMO and the loop bypass makes an awesome amp even better, more dynamic and "open" sounding.
Here's a little comparison I did:
The scoop mod is great if you wanna play clean.
The depth mod is a must for high gain tones IMO and the loop bypass makes an awesome amp even better, more dynamic and "open" sounding.
Here's a little comparison I did: