Similar to Pete I dived straight into a big solo ultra experience by attempting to run the 170mile Offas Dyke in one go. I had a few friends ready to ease me through the second night, but the first 2 days and night would be all by myself. And I loved it - one of the best experiences of my life. Full moon, clear skies running through quiet countryside is quite an experience.
Unfort I damaged the knee 70miles in and spent the night sleeping in the back of a small baptist church, until I was picked up in the morning lol
I've tried a number of different brands and this one not only rubs in easily without getting sticky, but also won't sting as much if you get it in your eyes. It's actually recommended by Macmillan Cancer (I know this because I've already had a melanoma). Surprisingly practical for a 50!
Weight quotes vary from 121g to 159g. Not bad for 6000mAh and 2.1V output, indicators, and an led backup.
I'm hoping to do wainwrights coast 2 coast in 3 days soon, which will mean limited rest, so I think 6000 or 9000 (3000+6000) should do the trick leaving the iphone on sleep constant running of a garmin 310XT.