I did with the Ultra 1 with my S8 Hermes but just sold my Ultra 1 when I got the S9 Hermes. I just like the aesthetic too much and the battery is more than enough to get me through 22-24 hours; fast charging while i shower is all i need to get to the next day.
I had the Ultra 1 last year. It was my first year without a new Series watch. This year I bought the Ultra 2 and Series 9 Hermes. I decided to keep the Ultra 2. I couldn't not justify spending $2,300+ this year and use a high end mechanical watch for more formal events.
Positives Ultra
1. Battery life - huge difference especially for my workout routines. I end my day between 60-70%. So I can go almost 2.5 days without a charge.
2. Flat screen design. The screen size is similar, but the screen feels nicer because of the flat design
Negatives Ultra
1. Size of the watch
2. Band selection is very poor
3. No Hermes bands - I don't like to mis-match lugs, but the pics on here - Kilim seems very doable