Hello! Tern Link P9 owner here. Have had the bike for about 3 months now, so still (relatively) early days. I use the bike to supplement my train journey into London - tend to ride for about 3 miles, pick up the train then cycle into work once I've reached Central London, then the reverse of that on the way home. That's when I can't be faffed doing the 22 mile round trip on the regular bike
My first impressions were pretty good even on the test ride. I tried the Tern and a couple of Bromptons but just couldn't get on with the ride of the Brompton. The Tern is a much comfier ride though I appreciate that the fold is less neat. However, as I bought it primarily for how it rides, I'm happy, and if faced with complete public transport meltdown I wouldn't be too worried about doing the 11 miles home on it.
The gears and brakes feel really nice and solid, and *touches wood* the tyres supplied (Schwalbe Marathon Supremes) have been great. I'm actually surprised with how nice the grip shift gears feel - I think I last had a bike with grip shifters when I owned a Raleigh Grifter XL as a kid

. I took the rack off which has lightened it slightly, but left the mudguards on, and replaced the saddle with a Brooks B17 - I wasn't overly keen on the saddle supplied. The bike itself folds pretty quickly, and the latches have a nice sense of solidity about them.
Ride wise, it's super comfy, and pretty nippy too. The 20" wheels don't feel too twitchy (IMHO), gearing seems fine (no problems on hills so far, it seems to handle the steep spiral footbridge over the railway line ok!) and I've even managed to scalp a few folk (*evil laugh*). All in all, I'm pretty happy with it.