Advantages Soft bristles, durable exterior, reasonably lightweight.
Disadvantages Non-pressured means you work, clogs up,can scratch/damage, pricey & almost pointless.
When I purchased my Karcher pressure washer in 2007, I wasn’t short for the extra “bonus” attachments that I got with the machine, although it was unusual at the time as to why no long scrub brush attachment came with the model in question. Karcher went to pains to point out that my K2.99MH had all the attachments I would need for a home and especially with outdoor use, it made no sense at the time to why no kind of scrubbing brush came with my model. For the cost price I paid, I guessed the bonus of having a patio cleaner that came with the machine “free,” would be a bonus in itself, but ...