Great alternative to resistance bands, though resistance is lesser at the initial phase of pull. Resistance feels significantly different as compared to resistance bands and cable pulley machines; leafpull feels more like an enlarged version of a retractable lanyard. Sticks well on windows, smooth tiles and smooth floor, provided you find the sweet spots. Did not try to stick it on doors. May be a little squeaky especially in 10kg mode. But works fine.
10kg is more than enough for elderly or beginners wanting to build a good foundation before hitting the gym. It's also useful for smaller muscle groups/accessory exercises/single joint movements even for intermediate gym goers; e.g. flyes/reverse flyes, bicep curls, tricep ext, lateral raises, leg ext/curl, hip ext, pullovers etc.
For the price, convenience/efficiency & effectiveness of workout, can really consider investing in a pair especially if you do not have the luxury of time or accessibility to a gym due to whatsoever reasons.