Product-review register. ~度に ('every time ~ happens') is formed from 度 ('occasion, time') plus に. 滑らか~ uses the extended vowel mark as an emphatic device ('smoo~oth'), common in informal writing and advertising. 感じがする ('to get the sensation/feeling that ~') is the idiomatic way to report a perception. 滑らす is the transitive 'to glide (something),' contrasted with intransitive 滑る.