I have a range of milwaukee tools - if retooling I'd reconsider and look into Bosch blue and DeWalt range.
Failures I've had;
- Mains/battery relay in jobsite radio
- Trigger switch in circular saw
- Clutch in brushed drill
- Electrics in brushless impact driver (common issue), causing switch issues
- Milwaukee branded battery failure after warranty period, 3 of 4 orig batteries failed.
Initially i bought Milwaukee as at the stage here in Australia, they hadn't 'taken off' and I didn't want the same gear as everyone else and the builders I worked with, they'd have used or knocked off my batteries... Now most ppl I work with have Milwaukee and by far in my opinion it's muc better than Makita gear which my boss uses, when I use it - it's underpowered and cheap feeling...
Batteries I've sourced from ebay have been half the price or less and hit/miss, when I get good cells (LG or Samsung) I've found the aftermarket batteries better than the supplied ones, they've lasted longer and in a couple of cases were actually manufactured in a better way in my opinion.
Looking forward, battery replacement price is an important issue, warranty coverage and claims (the ease of), for me I've had a choice of repairers and they've always done a good job, quickly, and not asked questions.
Try the tools out, feel them, try and actually use them in terms of driving some screws, drilling some holes etc then go from there is my suggestion! Good luck!