Lots of great responses here. To me, turn-key operators or marketers are best described as simply those offering an investor to purchase a hands-free, passive investment. As a potential investor you need to carefully evaluate what they are actually offering you. A large number of investors who are priced out in markets like CA, NY, HI will seek out "turn-keys" as a more viable option. I operate in metro Atlanta and we get daily inquires from cash investors from these states and many foreign countries. As with all types of real estate investing, there is a ton of variety among the turn-keys, some are "boots on the ground" meaning they and their team are very active in most or every aspect of the business model in that market. This is essential to your success.
Take a look at what each operator offers you and what the benefits and risks are. Some will offer you properties that they already own - these may already be renovated & rented...or they might be as-is where you can get their help to repair, rent and/or manage the property for a fee. Others might operate as our group does, to partner or joint venture with you to find, buy, fix, rent/manage and sell off distressed or off-market properties. All of us have mark-ups somewhere...either in the price of the property or in the labor/skill to required turn the property. I prefer a model where the turn-key provider has an financial incentive to perform, meaning they receive the bulk of their return from the property actually performing as promised. Turn-keys get slammed a lot online just like wholesalers do but you'll find this to be the best way to put your money to work in markets you would never be able to reach otherwise.
I would be leery of the whole "rent-ready" property as most of those stay empty for significant periods of time. Look for something that is rented. We do shared housing and that's a whole other animal. A lot of out-of-state & foreign buyers have been badly burned in Atlanta where buyers see values from a few years ago and think that is what they are buying today. The property might be rented already for you but there is no guaranty that it will remain so. Be cautious with the pro-formas as that's just like internet dating - I can't tell you how many times I have gone to meet someone on an internet date and could not even recognize them from their pictures...the marketed image and the reality were never even close. The same is true with buying from afar - as the 1,000s who have bought in places like Detroit and been burned can attest to. How someone says a property is "going" to perform and how it "actually" performs are often totally different things!
If you decide to do something on a property needing repairs, make sure the seller or joint venture (jv) partner will video the property in as-is state and do some progress videos. That is how my group does it and I'll be happy to share our details with you. Video will never lie but pictures do all day long. I spoke with an investor recently who bought a turn-key, paid for repairs and was sent pictures of the progress. Turns out, he bought a property and owns it but the pictures he was sent were never of his property. He paid fully for repairs that were never completed and now has to pay again or just abandon the property. Yes, BP'ers will say he should sue the operator. If you have to run to a lawyer, more than likely the cause is already lost and you're just tossing money into a pit IMHO.
Absolutely get a feel for the group you are thinking of partnering with....even a direct purchase is a partnership in my eyes as you are relying on them to get it done. Passive investing at some level is a great way to go but you can't be passive on educating yourself on the options. All you can try to do is cut your risks and being a part of BP is a good step towards doing that You have some very accomplished operators and investors from all over the country writing and posting here.
If you feel pressured by a hard sell....simply walk away. Make sure you understand each model presented to you as they really can be vastly different. Ask lots and lots of questions....good operators will try to educate you on their product, the process and their respective markets. Happy Investing!