I think the GI effects are basically the same between any of the -afinils, FWIW.

I wouldn't recommend them in general, but mostly because they last too long to really work with a normal 16/8 sleep cycle and the other stimmy effects can detract from things other than focus work.

I never took any long-term, but I've actually napped (purposefully) the afternoon after taking one in the morning, which is impossible on amphetamines.

Which is to say, they seem better to me, but maybe long-term use is different.