I really like the low speed control. I used a lot of 1-1/2" stainless fasteners for a few projects, and the problem with the old driver was that it was so quick that you could easily spin off the heads if you weren't careful. The surge at min speed was perfect for snugging them up. Likewise, no issues at all driving in beefy lag screws. The versatility of the newer drivers is amazing.
If you are looking to expand your personal tool collection, I found that the trick was to buy a few of the yard tool packages that come with larger ah batteries, and routinely go on sale. The leaf blower and hedge trimmer / pole chainsaw are all great homeowner tools, and go on sale as a package for really great prices and come with a mix of 6ah + 8ah batteries. Once you have a few batteries,,KMS & Summit have great prices on tool only. Likewise, if you know you are only going to use the tool periodically or it’s going to get really beat - the brushed tools are still fine, and go on sale for really good prices. My sawzall lives hard and will die young - I think I paid $75 for a brushed version vs $200 for brushless.