While it is surely more difficult to accidentally or negligently fire a gun with a 8lb trigger than a 5.5lb trigger, in the real world it's the safety device between ones ears that truly counts. We all have to choose the guns and the options that we feel most comfortable with and fits into our individual level or training and skill. Personally I think the Apex SD9 still has a good pull weight and break for safe defensive use. But I can also see the argument for leaving it stock.
I also agree with this statement, your main safety is your common sense. My finger is never on the trigger unless I plan to squeeze it. My friend has a glock with a 3lb trigger pull and it is light but you also still have control so I guess 5lb wouldn't be so bad.
I had the same line of thinking you do but was glad I did it once the kit was installed. The stock trigger isn't that bad and a heavier trigger isn't a bad thing. But my 8 1/2# pull went down to 5 1/2#, not a hair trigger by any means. Plus there still is a ton of travel. I still feel very confident that the gun won't fire unless I want it to. I'm not trying to convince you to get the kit, but I thought for $20, why not try it? And I'm very happy with the results.
Yeah I was thinking that also. $20 isn't a huge investment for such a simple and effective upgrade, I certainly was considering it I was looking for more posts like this to confirm whether or not it was worth the money. I have been hesitant because there are not many upgrades for this gun yet.