I’ve done it the last 2 years and completed it both times. It’s my favourite race and one giant adventure.
Most important thing to bring is a sense of humour (and midge stuff!).
Brake pad wise, I am running Hope X2s this year, and they are awesome. Only had to change one set of pads this year (and I raced Strathpuffer solo). The first year, I went into the race with a clicky/clunky drive train and it was pretty horrific to ride after 40 miles. Last year, I gave my bike a full service and it ran like a dream for the whole race.
If you’re running Avids, the sinted Clark’s pads are awesome. Look into baking your pads if it’s looking wet! I didn’t change my last year, and it was cool kicking it on the descents and seeing everyone disappear in the distance as they couldn’t brake.
The hardest half is the first half, pretty cruisy after Newcastleton.
Don’t take advice off anyone who started it but didn’t complete it. Oh, you also need to do that thing called training if you want to finish it 😉