Yes it is, I've built two recently. To be honest I'm of the opposite opinion. The prickley pear kit was a real challenge (mainly due to the buffers - I've got absolutely no idea how you're supposed to drill a large enough hole for them) whereas most 3D prints are a doddle.
The quality of the 3D stuff is definitely less consistent though, but Chris's models are excellent.
Will
I think I drilled a hole close enough and then used a triangle file to open the hole out. I've done 2 of those with a 3rd in the works. Also got one of his SECR ballast wagons to do to go with some Chatham kits LBSCR ones.