The main difference between the T10 and the T45 is size and features... the T10 is the basic model and is has limitations in the amount of water dispensed for brewing cup size. The T45 uses bar code technology to scan, acknowledge the type (i.e. tea, coffee, hot chocolate) and cup size (small, medium and large) of beverage being brewed. For the small additional cost, the T45 of T65 is the better machine. Look for special sales and coupon offers from vendors like Gevalia. We purchased our two T45s when they were first on the market; they retailed for $165 at the time. However, Bed Bath & Beyond offered a $50 mail-in rebate, so the upgraded T45 was the same price as the T20. Good luck with your choice.