I will get the new cart out to you today (after verifying it works well in our printer).
We have tested several sets of these new 850ml style carts in our 7900 and 9900 printers over the past +/- 6 months with excellent results, and have a few customers happily using them, so feel confident they work well and have a very few issues. Of course, nothing is always 100% perfect, but we feel there are many benefits to these carts over the internal bag carts, and have had great results and feedback with them.
Chips can be fragile, and wear out over time. The cartridges themselves are robust and likely last the life of your printer, but chips will occasionally need to be replaced. We recommend everyone have a set of spare chips on hand to be able to rquickly replace a chip and resume printing, to avoid down time of waiting for a new chip to arrive in the mail.
Please keep me posted as you install the other refill carts, let me know if you have questions or there's anything else we can help you with.
Best regards~ Dana