repeat 800's

I'm sticking with my old routine of 10-12 800's at 5:30-5:40 mile pace. I've done these for several years on the Monday before a Saturday Half-Marathon and the results have been very good. I ran a mile warm-up, then
10 x 800's
2:45,
2:40,
2:38,
2:40,
2:44,
2:43,
2:47,
2:44,
2:47,
2:39
then a mile recovery jog.
Wednesday some quiick 300's, then rest the remainder of the week.