Its a wetndry vac, that is not designed for gutter cleaning! Itlk pack in with any rough type of cleaning! I can only assume you guys don't clean too many gutters and are quite happy to plod along sucking up dry leaves and leaving the sludge behind!
All the gutter vacs are just wet and dry vacs , some have a cyclonic inlet retro fitted (easy enough to do yourself).
The grippa 2400 watt vac is a numatic (same make as the henry hoover and use the same motors/fans but has two of them).
The nilfisk is very close to it on suction and it is very well built.
JD , you appear to feel very passionate about this when you have not even used the nilfisk , do you have some kind of grudge against nilfisk ?
just for your information , sky vac use nilfisk vacuums for there gutter cleaning systems .