I'll give you some advice from actual experience.
I have owned 3 of the Taurus Slim pistols. First the 740Slim, then the 709Slim, and then the 740Slim again.
I have had zero issues and malfunctions with both the 709 and 740Slim. I first bought the 740Slim about 2yrs ago. It was a great pistol and is excellent for pocket carry or IWB. Capacity is 6+1 and comes with 2mags. Recoil is a bit hefty, but that is expected for a very slim and lightweight handgun that is shooting a 40S&W. I was new to CCW at the time so I decided I wanted a 9mm instead for the reduced recoil and cheaper ammo.
I sold the 740 a few months later and downgraded to a 709Slim. You gain an extra round and get 7+1 which is nice. Recoil is more manageable with the 709. After a few months, I sold it because I upgraded to a Glock. Nothing wrong with the 709Slim, I just happen to stumble upon a very good deal on a Glock19 that I couldn't pass up ($360 for the Glock).
After selling my Glock last Summer, I went back and bought a 740Slim Duo-tone again just last week since I had good experiences with the 740 and 709 in the past. I got the 740Slim because 40S&W ammo is much easier to find in my area vs 9mm. One big advice I will give about these pistols is that the trigger gets a little getting used to. To be truly effective, you need lots of practice. I found that you need to "stage" the trigger about 70% pull, then the trigger will break crisply.
As already mentioned, the 709 and 740 Slim have some nice features. External thumb safety, trigger safety, and a locking mechanism for storage. It also has a loaded chamber indicator, and will come with 2 magazines from the factory. Breakdown is extremely easy; it disassembles exactly like a Glock. Right now I can easily pocket carry the 740Slim in loose jeans or cargo shorts without a holster. The thumb safety is very useful for this type of carry. Carrying the 740Slim is such a breeze; I can just grab it and throw it in my front jeans pocket and carry it all day long.
As a side note, both the 709 and 740 have the same exact dimensions so they should fit in the same holsters.
Just for reference I've owned M&P9, M&P40, XD9, XD40, PF9, and Glock19 in the past. For the most part the 740 and 709Slim have been good carry pistols for me. Your experience may vary, so take that with a grain of salt. I would still recommend them if you are on a budget. FYI I've bought my Slim pistols between $300-350 in my area (FL).
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In short, yes I recommend buying the 709Slim. I think Taurus has improved their pistol line and have figured out most of the quirks of their handguns. My 740Slim was bought last week so it is a 2013 Model.