I have an original C series or TNC machine. I was always envious of the new low stature containers and when I noticed there was a 1.4l container available for my C series, I bought it. I have to say, it is nowhere near the quality of my original container. The clear plastic handle is quite thin and the lid is made from a hard plastic. This renders it completely inflexible and hard to fit.

I just recently purchased a new Pro Series 750. Immediately I realized the included 2L container would provide much more capacity than needed so I purchased the .9 and 1.4L containers. The .9L container fits rather nicely on the base (inside the fingers) with just a little play as compared to the 2L. It has a quality feel to it, thick plastic, stable handle, fairly confident seal on the lid. The 48oz however has a lot of play and spins roughly 1/4" on the base when power is applied. Also, the plastic handle is thinner so it has a little play to it as well. It is designed to fit over top of the fingers on the base much like the 2L however the plastic base of the container is more a rounded square and overshoots the fingers on the motor base I was hoping it would seat as nicely as the 2L and have the same quality feel however it doesn't. I don't understand why the 1.4L container doesn't use the same rounded corner concave square base as the 2L. For the price of the container I expect a better design.

I bought this 48oz container because the 64oz one that came with my 7500 is too large for smoothies and small servings of frozen desserts. The smaller container great for smoothies, nut butters, sauces, and hummus. I give 4 stars instead of 5 because it's hard to clean. For anything thicker than a smoothie, food gets stuck to the metal ring under the blades. Blending with dish soap for 30 seconds, as recommended, doesn't get all the grime. I've tried soaking it in vinegar, to some avail, but for the most part I've resigned myself to having a not entirely clean container.