I must confess that I own the TI-92 Plus, which lacks the on screen icons. However, I understand that they are otherwise the same. I own both the TI 83 and the TI-89, and this is far better.The 89 requires the Alpha key to enter text, a real pain. Plus, the 89 has 2-3 color codes per key, making it hard to read. The 92-Plus, and the 200 Voyager, eliminate that hassle for ease of entry and use. It is true that it is much larger, but so what? I have used it to actually try to learn math, and it has been very rewarding for me, eliminating drudgery. One other note of interest: this CAS program was originally written by the guys who wrote the Derive math program, a fabulous math tool. Texas Instruments purchased the company and now uses it in the TI series of calculators. Highly, highly, recommended.