I owned a Serius Medium. Fantastic fit an finish, seat and thigh comfort but... I wasn't nuts over it. It weathercocked a bit and a bit tender on initial stability.
i kept for two years. This was back in the era with Connyak when if you weren't suffering you weren't doing it properly. You need to try it and make some decisions for yourself according to your abilities, expectations and wallet. I personally learned that my comfort doesn't have to be a trade for performance.
The Connyak BBS