For many years I had a built in vac system.  I did not think anything could top its performance. A few years ago I bought the Shark Cordless Duo Clean for the cabin - light weight, easy to use, handle golds down for easy small space storage, good performance!  It is still in use after 5-6 yrs. + or -.
Feeling I would like to have a second vac "just in case" of break down & being W/O a vac, I purchased the corded Vertex.  All the same above features except folding handle.  You absolutely would have to experience its performance to believe it.  Its power is incredible!  I am A healthy 73 years - not quite as strong as past days - lightweight & easy use is a blessing any time, very welcome in this era!  Thank you Shark!!