HP Prime too complicated

[parisse]

I disagree with this comment, at least in CAS mode, you have access to "all maths and interrelations". And you have access to more advanced maths than on the 50G.
For example, you can define a non prime finite field on the Prime and make computation in this finite field. E.g. GF(2,8) will define a field with 256 elements and will return a generator of the field, by default g, then you can work with elements of the field (0 and powers of g), polynomials with coefficients in the field, matrices with coefficients in the field, all interrelated. For example a:=ranm(2,2,g) will define a matrix with random coefficients in the field, b:=1/a compute the inverse, you can check a*b.