Why spend $150 on an inferior optic, when you have $500ish to spend? Would you recommend that someone with a $50 000 budget for a vehicle,buy one for $15 000, and just spend the rest on gasoline? Or is it because you have one, because your budget was $150, and you feel the need to recommend what you bought, in some sort of self justification for what you had to settle for?
If the TRS-25 was as good as the PRO, it would cost $500ish. Best keep $150 aside to buy a replacement when it breaks, and before you reply with the usual, "but he isn't going to be shooting anywhere but the range with it", if he pays good money for a class, only to have his optic go down halfway through Day 1, think what a waste of time and money that will be. Aimpoints are acquiring such a reputation for reliability these days, that a lot of very knowledgeable guys are not even bothering to run BUIS any more.
Regards.
Mark