I've an 2017 ATT, which is very similar, the main difference is the ATT isn't intergrated, forks are the same though.

I love it, it handles well on climbs and descents and likes to be ridden fast. Seat adjustment could be better and front brake can be a fiddle to adjust, but nothing major, just a little more patience required.

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http://www.tri-monkey.co.uk

We had one of the original TTEs. We ditched it before we got round to wind tunnel testing it so can't comment on pure aeroness. It was pretty light though. It did had a few problems which mean I tend to advise caution with them.

1) Travelling with the integrated front end was a nightmare. The brake cable comes up through the headset bung and the one that was supplied looked like it had been cut by hand. They may have fixed this but it was a massive pain to adjust the front brake and the cable outer tended to fray quite quickly. Even taking the bars off was a pain. For context, I am very experienced with integrated 'superbikes'. This is an outlier in terms of how hard it is to travel with and work on, and not in a good way.

2) The lovely aero transition from the bars to the top tube makes it very hard to store food in a bento or equivalent. Not a problem if you have somewhere else to store it but if you like that location it won't work. They may have come up with a solution to this but they hadn't with the earlier models.

3) The integrated stem/bars cracked through the carbon around the area where the access 'hatch' attaches. Boardman and our UK dealer were spectacularly unhelpful both at the time and later. They said they thought it might only be cosmetic but couldn't be sure. To me and to the carbon repair specialists we took it to, it did not look cosmetic.

This happened on the day the bike was being racked for a race. The bars were visually fine (and we couldn't think of any other trauma it'd suffered) then were cracked after a final 11k test ride on smooth roads. The race mechanics in Denmark worked late into the night swapping out the whole integrated bar setup and recabling. Big cost to fix and nearly race over.

YMMV but I'd be cautious.