depends on what you want,
we still ue the omnivac which is 10 years old - but you can't get these now
Skyvac have a good rep, but are expensive - have a look at the gutter sucker range - I have a second hand one which is very good but came with 1.5" diameter poles (not so good) if they do 2" diameter poles I would consider them as a good all round choice without breaking the bank
Darran