I test rode an S5 Kenevo and, due to the really steep seat angle and rather slack head angle, found the cockpit very cramped. The Nicolai's do have the longest reach but, if you're tall, don't have a sufficiently high enough stack measurement to allay that 'over the bars' feeling. I can only surmise that their cockpit will feel as cramped as the Kenevo, due to the steep seat and slack head angles.
When I tried the Heckler, it was similar to my Trail Pistol, but felt roomier due to the slightly slacker seat angle.The new Bullit has a really good stack measurement and, being tall, you need a high stack, because when your seat's up for pedalling, you'll be hunched over the bars, weighting the front end too much for balanced handling. You also need to factor in a long ETT of 670mm or more, otherwise your knees will be hindering the bars range of movement and all these figues, combined with a longish wheelbase, will give you a long Front Centre and it's this combination of numbers that'll give you a comfortable, well balanced, ride.