I haved tried the E-07 rear in 150/70-R18 and in the 140/80-R18.
They have lasted around 8.000km each and i will keep mounting this tire.
I did mounted one 140/80 and i did very fast highway driving and i melted it (it was riding around his top speed, so i don't blame the tire for that), fun part is that when the tire was melting the grip was like a track tire. Also, that tire was recently mounted when it melt, so maybe break in helps.
The next one i mounted i tried to be gently on the tire.
If i had to choose between the 150/70 and the 140/80 i'll go with the 150, it seems the tire is MADE for the 950/990.
I have one one front E-07 in 90/90 R21 under my belt, the tire is no anakee 2, it's a real dual purpose tire, but i have got accustomed to it. The good part is that there is no wooble with this tire that i did got with the stock pirelli (2 sets). I am one of those drivers that the front and rear tire last pretty much the same, so to me, the front will last around 8.000 to 10.000kms.
My type of riding is agressive with lots of high speed driving. I can lean my bike with the E-07 at 190 km/H no problem, soo to me this tire is VERY good, it really does every terrain.
Hope it helps.
Need some parts? shoot me up an mail and i'll quote it to you.