Tenergy is a company that you know well even if you don't know them. They make a lot of the replacement batteries for everything, external power supplies, other electronic items. But recently they've added a few items to their line of products that reach out in an entirely different direction.
Tenergy Odev Tomo 2-in-1 Transformable DIY STEM Education Programmable Robot Kit is a robot kit that can be configured as a tricycle with two large wheels, or as a two-wheeled "bicycle" which operates like a Segway. Which is pretty amazing.
So far Tomo is my favorite out of the box Robot Build, and I highly recommend it. It is also very reasonably priced (see note on that below).
Tomo the robot has the usual sensors that come with such a device, including a line tracker and a distance sensor that resembles a pair of eyes. The yellow color of the framework and the overall configuration give Tomo a sort of Wall-E look, which is cute.
Assembly: Instructions are clear. Assembly involves the use of several different size bolts and nuts to piece together the various framework parts into the appropriate configuration, which differs depending on if you want the trike or bike. The parts are high quality ad perfectly machined. If you find yourself wondering why something does not make sense, that's you, not the robot. Check to make sure you used the right size bolts and re-read the instructions. The number of steps required to put the machine together is, in my experience with several similar devices, on the low side, so assembly will be quicker than you might expect. The kit comes with two tools which are of high quality, not the cheap knockoff screwdriver that you can't really use. (The screwdriver is actually very nice.) Note that the bolts use two different screwdriver bits, and the shaft of the screwdriver is reversible. When we did the initial assembly, Huxley, 7, did most of the work with me guiding and holding some parts while he used the bolts.
Hint: There are two steps to get the big wheels to stay on. Consider super-tightening the first step or they'll eventually (like, in a few minutes) fall off. I'm considering scoring the motor shaft with my Dremel to help the screw bite better. This is not a problem with Tomo, this is a problem with all wheels on all shafts on all robots.
Hint: The line tracing sensor has an adjustable height. This is an excellent feature. Go ahead and play with it to get it just right, which is probably lower than you are initially comfortable with. I find that this line tracing sensor on this machine works far better than others I've tested, but I'm not sure if that is the adjust-ability, the sensor itself, or the software. All are likely important factors.
Operation: Operation is right out of the box excellent, using an app that runs on Android or Apple. I did not test the apple version. The app that controls the robot is easily deployed and well designed.
Programming: This may be the best feature of Tomo. The programming app is designed for Android or Apple devices and works great. The programability is flexible and powerful, and the Scratch-like programming interface is top quality. Every now and then the unexpected happens, but I think that has to do with Bluetooth connectivity issues. Hint: When programming keep the Android/Apple device and the robot right near each other. This may be just Huxley, but the programmable sounds and lights are of greater interest than the movement of the robot, ad least for the first hour or so!
Guts: The processor board is based on Audrino architecture. I've not hacked it but it should be totally hackable. The processor is hooked to the other bits with Rj11 male-to-male cables. Our cat ate one of them and we were able to easily find replacements.
NOTE ON PRICE: At this time, the Tenergy Odev Tomo 2-in-1 Transformable DIY STEM Education Programmable Robot Kit is about $30 cheaper than any similar robot, but also comes with a number of other deals including 10% off a second robot, and discounts on various other products (see the link, click on the "buy one get a discount..." link.