Harbor Freight makes some great tools. As long as you know the capabilities. Mainly, you can't, for the most part, get replacement parts. Ever try getting some bearings for one of their trailers?
Personally, I consider most of their tools a cheaper way to rent specialty tools that I don;t necessarily want to buy.
The hand tools are a different matter, they are actually quite good.
If you are going to replace your HF finish nailer, you have some options. If you don't use it that often, get another HF. If you want better quality, try a Pawn Shop, sometimes you can find a good deal on used or even brand new tools.
Or you can go to Big Box stores. Home Depot has some specials on Finish nailers at the moment.
The HDX Pneumatic Finishing Nailer Kit with Canvas Bag (3-Piece) for $90 down from $110. (just a step up from HF)
Estwing Pneumatic 2-1/2 in. 16-Gauge Straight Finish Nailer with Canvas Bag for $85. down from $100.
Husky Finish Kit with 16-Gauge Finish Nailer, 18-Gauge Brad Nailer and 18-Gauge Stapler (3-Piece) for $152 (I have this kit and it is a pretty good deal, but I do want to trade up, I want an angled finish nailer.)
Lowes doesn't have any specials, however:
You can get the Metabo HPT (was Hitachi Power Tools) 2.5-in 15-Gauge 34-Degree Finish Pneumatic Nailer for $109 which is rated highly and comes with a case.
I like it and may just have to get one.