I'm really happy with the sphygmomanometer, also the value for money is unbeatable. For me, the unit is absolutely convincing and very easy to use: Laying cuff around the left upper arm, close Velcro, push little buttons, wait, done! I can recommend it to anyone who would like to occasionally check his blood pressure at home.
I have read some reviews after buying, where it was said that the equipment was unreliable, large measurement errors, etc. ... I can not say. You should possibly consider that measurement errors often caused by incorrect handling.