Thanks, shame, I think they need an upgrade. Gatwick Express is more comfortable in my view, I'd love Thameslink to be more like those!
Am I the only one to remember when the 387s seats were slated as being like ironing boards?
Personally, I don't find 387 or 700 seats to be uncomfortable. The leg room and space between you and your neighbour is more of an issue (in standard) and at peak times, the likelihood of having to stand - but the contrast is a train where you're even less likely to get a seat at busy times and standing can be very cramped.
If you get a seat on a 387 then it all changes. A far nicer interior ambience and comfort for sure, and for the GatEx (and HEX) great, but for commuting - less so if you're joining the train part way through its journey and it's already busy. For that, you have the incredibly basic first class offering, but so many 387s have it poorly marked inside and out so a lot of people won't know where it is, and of course you get even more people sitting in there - some knowingly and some genuinely unknowingly.