The HP 255 has an AMD E processor family which is better than the Intel Core i5-5xxx processor family found on most portable PCs that have been around for more than a year.
An AMD E processor family is actually the worst processor family across all comparable spec laptops that came out around the same time as the 255.
Across similar types of notebook PC the best processor family is Intel Core i7-3xxx.
It may also be worth considering one of the alternative portable PCs that have an AMD E processor family currently available including the Lenovo B50-45, or the Acer Aspire V5-123 which is cheaper.
If you are looking for a notebook PC with a better processor family then you might want to look at the Aspire ES1-111m (Intel Celeron), the Aspire E3-112 (Intel Celeron), or the Aspire ES1-512 (Intel Celeron) all from Acer which is also cheaper.