I just installed an Sbooster on my T2. I consider it to be a tweak. A bit of a leap of faith that makes some sense on paper, but am unsure if it'll be worth roughly another 10% investment. I will leave it on for a week or so to let it break-in before I pass judgement. After an hour it certainly hasn't made anything worse ;)
Fuse? When the Sbooster is installed, the Lumin IEC connector/fuse holder is removed. Any fuse you might want to change is within the Sbooster. Not sure I'm ready to start tweaking what is already a tweak.