Just got the trichocereus without the arm in the mail three days ago, so it's still getting adjusted.
I never put the lophs outdoors, I have had the ceaspitosa for over 4 years and I think it's doing great. The 2.5 cm and the pups I have not had as long but I feel they are doing great As well. Trust me the lophs are well taken care of and well looked after.
The trichocereus with the arm has been through some hard times. It had a fungus on the roots that turned the top of the cactus into black mush, I had to buy new soil and a new pot and set it up in that, since then it's been healing up nicely. All the arms that it has produced have been healthy. It was sick last year,this year it's been doing great, I think it's recovering quite nicely.
I keep the trichocereus's under a hydro-farm box with 8 24W high out put florescent lights, it's worked well so far, though I'm always trying to make improvements. (I live in Denver in a small apartment, I'm honestly doing the best that I can with what I have)
-EG