I have used the search and found lots of great reviews on the Little Wonder Blowers. What about the new Billy Goat blowers with the hand controlled output spout? Are they any good? Would the smaller 5 and 6.5 hp models be sufficient for residential areas or would the larger 8 hp models be o.k? Also, is a ground blower really needed or is a backpack sufficient? I currently have an Echo PB650. Thanks.