Calculators you regret buying?

[polbit]

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"Wouldn't be a good month on HP Forums if it didn't involve some good old RPN vs RPL debate

Unfortunately we didn't have internet back in late 80s and nobody told me what an abomination RPL is, so I went ahead and purchased my 28C. Ever since then I have been an ignorant RPL user that has written many a program, obviously not realizing the error of my ways. If I only knew how wrong I was then..."
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I learned fairly quickly to heavily utilize the directory structure and reuse subroutines. With the dynamic stack I always found it very intuitive to program in RPL environment. Yes, readability can sometimes be an issue, but it just takes some practice to both design your programs to be clearer and to read them quickly. After a while it becomes second nature.