First of all, I really enjoy the campaigns you are doing - keep them coming!
The feedback for the Testnet is overwhelmingly positive. The first time I've tried VITE I was amazed how well everything worked on my first try.
Both Web and the new Android Wallet are beautiful, had no problems with them whatsoever.
At the beginning I was not aware that the accounts are only stored in the Local Storage, and never server-side. Would have appreciated a small infobox explaining that (because it's an awesome feature).
The first campaign I participated in was the Twitter VCP challenge, which explained remarkably well how VITE works.
Wow! This was what surprised me the most! - I participated on day 2 of the Full node campaign. And setting a up a full node up was by far easier than for other cryptocurrencies. Granted, the guide from snapsecure helped, but it was easy and it worked! Compared to IOTA, I struggled a day to get the initial sync done (and had use a database snapshot). For VITE, I waited 2 hours and everything was synced and ready to go. And it is really resource-friendly, running on some low-power hardware (Go seems to be the better choice here - compared with IOTAs IRI implementation in Java).
After one unexpected poweroff of the server, I had problems getting in sync again (haven't tried it for long though, just wiped the database and started from the beginning again).
Huge bonus points as well for the dashboards to monitor the nodes!
Have not yet tried the new integration in the wallet, but also the step-by-step list of the old guide worked perfectly.
Not directly Testnet related, but I like the redesign of the website - everything VITE stands for is explained really well.
So, I really, really tried to provide some constructive criticism.. but I honestly can't think of anything that could be improved. If I do, I'll tell you
Looking forward to the future - which, as I know you, will happen sooner than expected