Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
I can remember when this first came out.  I got one and instantly I fell in love with it.  Since then I have purchased nothing but this trackball.  I hope they never stop making it!  I have one for work, one for work laptop bag, one for my personal laptop, one for each of my desktop PC's.  I think I am keeping Logitech in business all by myself.  Just a real solid trackball.  I only get the WIRED one though, not the wireless.  Not to big on wireless devices for PC's.  They are better, but the classic trackball like this one, really the best, no need for improvement in my opinion!

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive