To Finish modding or not

The McIntosh 7150 is a Direct coupled circuit design one that McIntosh has used for a few decades I owned the MC 7200 and it was a fine amplifier great sound. However this circuit design is not McIntosh’s best. For a number of years in the 2000’s they were making Double balanced push-pull amplifiers in the 300wpc to 500wpc range, these are truly worth owning. Now McIntosh makes High power expensive Quad balanced designs.

Matt M

If you are keeping it for years to come, it may not be a bad choice, however, even though I would expect improvement, I would not expect night and day improvement.. next,  after the mod, your Adcom won't be worth much more than it is worth right now, so if you don't love the mod, then this may not be the best investment.  
I would encourage you to figure out how much the amp is worth if you sold it today and how much an amp that you would really like to have would run and start with that comparison.  For instance,  (just a random number, I have no idea of value)  you can sell your adcom for $800 and it would cost you $1400 to mod... without any other outlay of cash, you have to ask "What amp can I buy for $2200, am I better off with that than the modded Adcom"  
Good Luck with your quest,  Tim

After market mods are worth about .10 cents on the dollar at re sale.Unless you are emotionally attached to your amp sell it and move on.