Sorry - a little late to the Tripster update party, but mine's nigh on 3,500 miles old now, having got it just under a year ago (see near the top of the thread).
I'm 5'11", 31" inside leg and am very glad I went for the 54. I don't have lots of post showing and run, I think, a 90mm stem.
In short, it's an utterly superb bike. I stripped my carbon road bike down within a few months as I wasn't riding it and am now down to just two bikes in the garage - this and the old 456 that's brought a spark back to my mountain biking. The Tripster robbed every spare hour I had for bike rides...
I commute once or twice a week on it (22m each way, lanes, cycle paths and a few main roads), done a bit of light touring (Cheshire Cycleway 180m in a couple of days), long days out (92m the weekend before last at a decent lick around the lanes), a bit of light offroad, but in fairness, hardly pushed its skills in that area. I rag around after work for an hour or two and have some nice Strava times, I take it out in all weathers, ride it where and when I want.
It's a proper bike - like what you 'ad when you were a kid. None of this 'hardtail / full suss / downhill / enduro / BMX / roadie / fixie / tourer / commuter' rubbish. It's just a really, really good bike.
Standard autumn, winter, spring build is the latest spec Kinesis CX Disc wheels (light, strong, pretty) with 28mm Conti Gatorskins, or maybe some 4 Seasons if I'm feeling flush in a few months. SKS mudguards, full Ultegra 5700, TRP Spyres, Ritchey WCS carbon bars and post, Ritchey 90mm stem, Gusset saddle (the Spoon-a-like), Time Carbon/Ti MTB pedals.
Summer time (see Maureen checking it out last Sunday, above) - guards off, 25mm Gatorskins on. I think it's 17,5lbs at the mo. Can't complain at that.
It's quick, sprints, climbs, descends, ride all day comfy. It is absolutely without fault. Dunno how Dom did it, but it rockets away when you press on, yet never does that carbon 'pea on a drum' thing on the rougher roads. I bought it as an early 40th present to myself - the old alloy Tripster did me proud and convinced me of the benefits of a disc braked, do it all road bike, but this one takes it to a whole new level.
Bah - I've been found out. It's an absolute corker; you really won't be disappointed. I've ridden some very nice bikes in the last 20 something years and the Tripster's the best of the lot.
Somafunk: yours looks the business. Really pleased you're still enjoying it so much too.