Elvie rechargeable kegel exercise trainer

Hello - I am interested in ordering the Elvie rechargeable kegel exercise trainer, which is controlled using an app. there is just one review, though more on Elvie's own website.

does anyone have any thoughts or comments they'd care to share? thanks!

product is here, currently on sale: https://www.lovehoney.co.uk/product.cfm?p=40515