I’m sticking with my S21 Ultra for as long as it lasts. In about a year, I plan to have the battery replaced directly by Samsung to ensure I get an original part and maintain the water resistance. ​The smartphone market has hit a plateau—there are simply no meaningful, real-world upgrades in newer models that I would actually notice day-to-day. ​While the end of security updates isn't ideal, it's not a dealbreaker for me, especially since I only download apps and content from trusted sources.

Here is my personal review comparing the Medtrum Nano and the Omnipod. Since I used AndroidAPS (AAPS) for both systems, this is strictly a hardware comparison. I can't comment on either manufacturer's official looping algorithms. I also paired them with a Libre 3, so I have no experience with their native CGMs.

Why the Medtrum Nano Wins for Me

• No Tunneling or Leaking: With the Omnipod, I constantly dealt with insulin leaking back out of the infusion site. With the Nano, this is completely gone, no matter where I wear it.
• The Steel Needle is a Game Changer: I was skeptical, but you don't feel the steel needle at all, neither during insertion nor while wearing it. It is significantly thinner than the Omnipod's Teflon cannula. I measured the Nano needle at 0.12 inches (0.3 cm) compared to the Omnipod's 0.28 inches (0.7 cm), making the Nano needle about 57% thinner, which makes a massive difference in comfort.
• Pre-filling Capability: You can actually pre-fill the Nano pods ahead of time, which makes a quick change on the go much easier.
• Size Matters: The pump is exactly 50% smaller in volume compared to the Omnipod. It feels incredibly discreet and lightweight.
• Extended Wear Time: Using it with AAPS, I can easily stretch the wear time up to 5 days, making it much more economical and less wasteful.

The Downsides

• Complex Filling Process: Setting up and filling the Nano is definitely a bit more tedious and takes more steps than the straightforward Omnipod fill.
• Adhesive Residue: The glue they use is stubborn. It stays stuck to the skin well, but it leaves annoying black sticky residue behind after you peel it off. Overall, the hardware advantages of the Nano—especially the steel needle and the tiny footprint—make it the clear winner for me over the Omnipod. It's so much better in daily use.

Pictures is ai generated for visibility. This is no advertisement, just my personal review. https://i.imgur.com/7SqtJYa.png