My thoughts ... depends why as ST owner would want a change.
If it's a forced change, eg. ST has been written off, or their current ST has very high km and costs to maintain or repair are not economical, and if the current ST owner is very happy with an ST, there are enough low km ST (of the 13 variety) currently on the market that would be a better alternative to the Triumph.
However, if it's a change because at around 330kg the ST is getting too much to handle, the Triumph at around 270kg would be a viable alternative - for me anyway.
Many of you have met my mate Phil (Wooli, Port Sorell and many RTE's), he had an Triump Sprint ST 1050 - even lighter (240kg). He loved his ST, only sold it due to the riding position was too painful after a leg injury.
Yeah, I see this as an alternative in the future. Ask me when I'm a 75yo.