Just got my hands on these 100 T5577 RFID cards, and I’ve been putting them through their paces for a couple weeks now. Here’s the real deal on whether they’re worth your money.

First Impressions: These are *thick* boys – 1.8mm feels substantial compared to flimsy hotel keycards. The PVC material has a nice matte finish that doesn’t show fingerprints easily. Came neatly packed in a plastic case, no damaged cards.

Programming Experience: Used my Xixei X7 replicator (yes, the Chinese one!) and 99/100 cards programmed flawlessly on first try. That one dud card? Might’ve been user error when positioning it. The rewrite process is smooth – erased and reprogrammed some cards 5+ times with zero issues.

Real-World Testing: Worked perfectly with:
- Office HID reader (H10301 format)
- Apartment keyless entry
- DIY Arduino RFID project
The thicker design actually helps – doesn’t bend when swiping like cheaper cards.

Annoying Bit: They arrive completely blank (as advertised). First-timers might panic when their reader doesn’t detect anything – you *must* program them first!

Pro Tip: Label them immediately after programming unless you enjoy playing ‘guess which card opens the server room’.

Verdict: At this price point for 100 quality rewritable cards? Absolute steal for anyone managing access systems or doing RFID projects. Just keep a spare writer handy.