Summary: It is a classic. I do not know why they discontinued the 85 & 86 series, but they are the most user friendly in my opinion. The 84 will get the job done, but not as well and the 89 is just not for me. I mostly do trig and some light algebra on this for work and it makes my life much easier. I went two years without one when my last one finally died and am so happy to have one again.
Summary: I needed a replacement for my TI-86 that just died (after 16 years), and I found the same model on Amazon that works perfectly fine. The open parenthesis button is missing the paint and a few keys stick a little, but it was worth the purchase. I haven't tried the graph link yet, but I'm sure it works fine if I decide to replace my phone to play Tetris.
Summary: I gave this product a low rating for two reasons: 1) Several horizontal lines of pixels on the screen do not work. Given this, it is often difficult to see calculations. 2) I have had several power issues with it - it doesn't always turn on and I have to troubleshoot it to make it work. I didn't "hate it" because I only paid $25.00 for it. I suppose you do get what you pay for!
Summary: Because of the "stock" picture posted by Amazon (according to seller) I expected a cord with this item. I didn't get one. The seller explained to me that the picture he posted did not have a cord. But his description didn't say "does not come with a cord" like many of the other descriptions that I looked at. I was disappointed, but the calculator works fine.
Summary: bought this used, so it didn't come with an adaptor, uses batteries very quickly, and constantly have to adjust the contrast during calculations. Directions were easy to find on you tube, and the seller was wonderful with trying to help us figure out the contrast problem, but without an adapter, it just burns batteries. Otherwise... its fine.
Summary: I gave him a five cause it came with what i needed. what i dislike is not the calculater because ill just need it for one class. Id recommend this product to whoever needs any math college course.
Summary: So I got this for my wife's college math class and it works great. My only problem is that the picture definitely show a transfer cord and I didn't get one. It doesn't describe whether or not one comes with the calculator in the description so I had assumed that it did. However, apparently I was wrong. 4 stars for no cable.