Iv currently gotta a springer cross lab purley for dogging in and the odd bit of rough shooting (still only young), there really isnt anything to gain or lose for that matter by crossing. i seem to have struck lucky with mine mind, she has the hunting instinct of the springer, decent size to her, doesnt put on weight to easy yet she is very biddable and layed back, alot of cross breeds work out for the better and you dont know unless you try, find a litter out of good dogs and it will be a useful dog.
Regards
Aaron