Must admit, I pick Retention for rp reasons, but I think it still can be useful, and works well with Comprehension. They help you do more damage for longer, have more critical hit chance for longer, more effective when sneaking, selling, picking locks (if several locks within a certain area), etc.
An interesting combo I thought up is...
If you're playing an energy weapons character, specifically one with the GRA Tri-Beam Laser, crits are very important for you. With that Lonesome Road perk that lets you consume magazines, you can regularly use True Police Stories to give yourself an additional 15% chance to crit, with Retention making them last long.
Retention is of course optional since you can produce the magazines in bulk, but it's a nice convenience to have.
Depends on the character I am making. I have spend countless hours playing New Vegas, so I decided to make a "perfect" character. I have leveled almost all skills to 100 ( Meele and Unarmed are the only two not at 100) and I have my S.P.E.C.I.A.L's at 10/10/10/8/10/9/9 if I remember correctly.
How?
You're suggesting a character with 66 SPECIAL stats. Every character has a base of 40 stats, can get another 7 from implants, another 10 from intense training and an additional point for completing Lonesome Road. Tha only makes 58 total. Where'd you get the other 8?