Ok, I know I'm a fan, but this is an interesting debate!
I don't get the references to frame flexing. Despite my attempts to thrash the life out of it so far, I don't notice anything resembling frame flex, like Jay Clock it all seems a bit girder like to me. Bear in mind that you have a hinge for the rear-triangle which could give that feeling. I'm 85kg approx with the std saddle, Brompton tyres at 100psi and the hard suspension block and don't find the ride that harsh. OK it's not as plush as my old 531 Holdsworth (neither does it flex so much), but it's not bad at all over the 30+ mile trips I've done on it so far. Over rough German cobbles along the Rhine it's a bit teeth chattery, but that's more likely due to 16" wheels. Harsh ride and flexy seems an odd combination.
In terms of speed I find it pretty damn quick! OK, it's not for the Sunday morning pseudo-peleton-race-wannabe run, but it's plenty fast enough for commuting, FNRttC, social riding and is not slow against hybrids, slicked MTB's ridden by every day Joes. It accelerates faster then most bikes and around town is far more nimble than a regular bike which now to me feels barge-like in comparison. Luggage options are good too.
After trying a Brompton and a Dahon, the Brompton gave me the biggest grin factor.
In terms of VFM, that's always a difficult question. Certainly one of the reasons for the high cost is the fact that it's hand made/customisable in London rather than a std product from the far east. Neither is it a high volume product. Also, to enable the unique fold etc. a lot of parts are Brompton specific which again adds more cost compared to OEM supply. So the build cost of a Brompton
is going to be higher compared to a Dahon for example. The rest is 'Market Pricing' and currently the evidence is that whether it's the extra utility, the adaptableness, the fashion appeal, back-up, service, longevity whatever, the Brompton seems to be able to command and hold a higher price in comparison to many other mainstream folders because the purchasers deem it worth the extra. In my case there are good flight-case options and aircraft accesibility and portability with a Brompton which for me is also a benefit worth the extra cost.
@colmac2000
If you're really not that enamoured, then maybe it's best to sell it on?
Alternatively, approach it with a different mindset (post-purchase dissonance is not unusual among bike buyers either). Clearly there is a disconnect between your expectation and the reality which is not uncommon. Sometimes appreciation takes time.