We absolutely love it. It is fantastic on lakes....often we have to paddle only one way. The speed varies, depending on a wind
. We have a tandem kayak
, so one person can devote the hands to the sail. ( Some type of gloves is recommended) Yes it can be mounted to brackets on kayak's sides but often the wind
is not steady enough and most of the time some turning of sail is needed.
It is also a nice topic of conversation with other kayakers