i got tat yesterday during a custom game of 2v2AI
got it when my ultralisks were rolling over their bases 

i think i recall reading somewhere that only one science vessel can repair one unit at any time, so even if you bring 5 vessels your healing output to odin isn't high.

on the other hand you could theoretically spam scv's and they would all repair him at once.

also, odin has killer ground attack but (relatively) weak air attack.

they're more reliable than pulling SCV around la.

btw i use SV to irridiate the leviathan in Shatter The Sky. was fun.