Looking at getting a set of workshop allen keys, as my cheap multi tool keeps rounding allen bolts.

I see some allens come with ball ends, what is this for, to get into some hard to reach places at a slight angle?

Any recommendations on a good set of workshop allens? I was looking at the pedros y spanner in both sizes, any good?

I use these

http://www.singletrackworld.com/forum/topic/which-ball-end-allen-keys

Not as posh as snap on but these work for me. In metric though.

what is this for, to get into some hard to reach places at a slight angle?

Yes and they're very useful.

i use these

I use a Park set from CRC. Good allen keys are worth every penny in my opinion and the Park ones have done a great job for me.

so do I go for ball ends or not?

Remember, ball end for winding bolts in or out, not undoing or torquing them down.