I love this device! I'm an older man, weight training 2-3 times / week for fitness and longevity. I've been going to a gym, but the go-tone pro makes the limited space in my home into pretty much all the gym I need (though I will go to the gym sometimes, for the social aspect). I got the bundle, and all of it is useful for me except for the ab roller which I haven't used yet and am unlikely to use. I think I actually get a better workout with the go-tone, because it is so easy to adjust the resistance and I always work to my max, whereas with weights I'm often too lazy to swap out the weights I've set up. It's great to be able to adjust in 1kg increments!
Two small nits. First, the "cable" that you pull is actually a thin, flat strap. The last couple inches tend to get twisted and, when they do, the motor doesn't pull it all the way in. Not a big deal, it just takes a few seconds to fix, but it's a little annoying.
Secondly, I haven't run the iPhone app that can be used for control, "tt bot". As I understand it, this is not Rayofi's app, but rather a third party app. In order to use it, you must first register with them (not Rayofi, but the developer of the app). In order to register you need to check the box that says you've read and agree to the privacy policy and the EULA. The problem is that, although the app is in English, both of those documents are in Chinese. Since I'm unwilling to agree to something I can't read, I can't register or run the app. This isn't a big problem, because i can use the Go-Tone just fine without the app, but it is a little annoying. Johnny tells me that Rayofi is working on their own app for release soon, so hopefully this problem will solve itself. Admittedly, if a firmware update that I want comes along before the new app, I'll have a decision to make about this.
One other thing to note. I like to do circuit training, rotating through sets of 2-3 exercises. Because the bundle comes with two units, I can set up for one exercise using the the door strap, the other with the foot plate for a leg exercise and move between them quickly, perhaps adding a bodyweight exercise like push-ups for a third in the circuit. It's a good reason to get two of them, even if you don't expect to be doing bar stuff where two are required.
Despite those two very minor nits, I love the go-tone pro, and highly recommend it.