Long winged cone head cricket

We appear to have long winged cone head crickets in our garden - I have so far found 4 on various plants. We back onto a wooded park so presume they've come over from there. This is the first year I've seen them though. I've googled them and it appears they shouldn't cause too much of a problem eating our plants - but that's my question. Should I leave them to get on with life or need I worry they may eat the life out of the garden?