I've had 3 of these over the past 20 years. Couldn't live without it. It is useful for many functions. I use it mostly for toasting, baking and roasting making it unnecessary to heat up the big oven. It is a perfect size for a one or two-person household.
I have a limited number of things I need an oven for: mostly small batches of cookies, warming frozen fish sticks and such, baking mini cakes, and making toast. For all oven-related tasks, the Breville Smart Oven is great. Even baking, good temperature regulation, and I love that it shuts off with the timer. No complaints at all about baking or roasting. My sole complaint is I can't get toast to my preferred degree of toastiness. On selecting the darkest toast setting, and nearly 7 minutes in the oven, the toast is only moderately toasty.
Bought this for my parents for Christmas because we have had one for years and love it. It was just what they needed and they are thrilled with it. Compact but roomy inside and pretty much does everything a toaster and oven can do. Very happy with my purchase!