I found Slow tech Progress interesting because in the vanilla game the resale of aliens artefacts gives too much money. With only 3 probes you can practically fill up laboratory with scientists ! And if the alien weapons researchs is more long/difficult, it will give more space to other secondary weapons.
I still miss retreat to have a precise idea on this mod in particular, but I do not want to withdraw any options which make it to improve the interest of this game. And it's possible to use only a partial of mod. So all is question of balance.
Personaly I use the precision according to the distance (I use many thing :p). For the few weapons which I tested, Sniper is very powerful, shootgun nearly useless, and minigun very funny (2 hits on 20 fire, not bad for 8% accuracy !)