"You look so familiar!" "Are you sure we haven’t met before?" "Do you come here often?"

These are all lines you’d expect to overhear in Las Vegas, just not necessarily on the floor of the Consumer Electronics Show, the largest tech trade show in the world. Of the many thousands of new products that debut each year at CES, a smattering seem more than vaguely familiar to our experts. That’s because after an initial unveiling, some CES products are slow to transition from prototype to production line, and are essentially being introduced all over again.

One reason for the holdups may simply be that companies, eager to make news at trade shows, are overly ambitious in their release schedules. “Small start-ups are eager to secure funding or start turning a profit, and big companies want to be seen as innovators and thought leaders,” says Angela McIntyre, Research Director at Gartner Associates, an information technology advisory firm.

Issues of scale also complicate the process. “A company may make 100 working units before a trade show and find that one fails. That’s not a big deal, but if that same 1 percent failure rate holds when you start producing 100,000 units, it can cause serious production delays,” she says.

Another issue is the nature of what products are expected to do. “Voice recognition and artificial intelligence in particular are being used more and more, and they’re two of the most complicated technologies to build into a new product,” says Jim Barry of the Consumer Technology Association. Since smart home products rely disproportionately on both technologies, the delays can really add up for connected devices.

So, as CES 2017 kicks off, we’d like to revisit a few of those smart home products we first met last year. Here’s hoping that this year, what happens in Vegas doesn’t stay in Vegas.

Delta Leak Detector (shown above)

What we liked: Connected leak detectors are nothing new, but these offer remote monitoring with a free app, eliminating the need to invest in a costly smart hub. They’ll also detect as little as several drops of water—other models often require 1/16 inch of standing water before they’ll go off.
What to expect: Delta aims to make their leak detectors ($79.99) available for pre-order by July and start delivering by fall.

Halo and Halo+ Smart Smoke Alarms

What we liked: The first smoke detectors that actually do what all models should—combine both types of smoke detection (ionization and photoelectric) along with a carbon monoxide alarm. Like all smart alarms, they’ll warn you via a smartphone app if they go off, which is helpful if you’re not at home. The Halo+ has the added feature of audibly announcing severe weather warnings for your area, or sending them to your phone.
What to expect: We’re told the Halo ($99) and Halo+ ($129) will both be available later in January 2017 and sold through retailers like Amazon and Lowe's.

iDevices Outlets and Light Switches

What we liked: Too many smart home products require buying and connecting platform-specific hubs, bulbs, and fixtures. iDevices plans to do away with all of that by offering hard-wired outlets and light switches with a built-in WiFi chip, allowing you to use a single app to control just about anything in your home. Plus they’ll work with Apple HomeKit, Amazon Alexa, and Google Home to let you turn things on and off with voice commands.
What to expect: iDevices has made switches and outlets ($99.95 each) available for pre-order now, and intends to offer dimmer switches later this year.

SimpliSafe Smart Camera

What we liked: SimpliSafe’s smart camera offers features you’d find on most models, like live streaming, night vision, and intelligent recording. But what makes it unique is the one feature you can’t see—real-time monitoring by security pros. It pairs with SimpliSafe’s other connected security products, such as motion and entry sensors, smoke and CO alarms, and even freeze detectors, all of which can be installed easily by a homeowner and professionally monitored for $15 a month.
What to expect: After unveiling a prototype at CES 2016, SimpliSafe released a beta version of its smart camera ($99) in August. While the hardware is final, we’re told more features (like two-way audio and the ability to record on demand) will be added using an automatic software update in the first half of 2017.

Brinks Array Lock

What we liked: Most smart locks burn through batteries, but the Array promises to use solar power—or even porch or street lights—to recharge the built-in lithium ion battery. Brinks promises batteries will last a year, and, with enough light, they’ll never need to be replaced at all.
What to expect: Since showing the Array lock at CES 2016, Brinks hasn’t set a sale date, but you can use its website to be alerted when it’s available for pre-order.