I love mine. Many of the initial quirks have been worked out with updates. Still more to go. But it looks like Tivo is certainly working on these issues, as there has been a new update basically every month so far:
2/7/2020: 21.9.2.1.v8-usm-12-d6f
3/10/2020: 21.9.7.v3-usm-12-d6f
4/31/2020: 21.9.7.v7-usm-12-d6f
6/2/2020: 21.9.7.v8-usm-12-d6f
7/24/2020: 21.9.7.v10-usm-12-d6f
I love the processor's speed, made my old Premiere look like molasses
Slide Pro remote doesn't work yet. Apparently not high priority, but the Lux remote is fantastic. I haven't really been missing the Slide Pro much actually. The Lux has motion activated backlight, the Slide Pro needed a button press.
Not having been through a Roamio or Bolt, I dove right into the TE4 interface and I find it intuitive. Sure the diehard TE3 fans have a laundry list of things they call "deal breakers", but it's not a steep learning curve IMHO. I'm also single, too, and many blame the TE4 resistance on a spouse.
In fact I like it so much, that although my HOA has chosen Hotwire fiber service to replace Comcast, and since I don't thing Hotwire is going to have cablecard compatible service, so I'm gonna pay out of pocket for a full Comcast bill without the HOA fee subsidy. Maybe I'm just crazy. Never seen a cable company DVR that I liked.
edit...
I just noticed you'rte also making a huge leap from a Premiere, just as I did, so the features available on it that the Premiere didn't have the horsepower to do, the Quickmode feature is neat Works great for the news and weather on TV. Also a challenge when quizzing yourself while watching Jeopardy. There's a SPS code to change the speed too.
Premiere didn't have the hardware to stream recordings to your smartphone, either on LAN or WAN. I don't even get good service with Verizon at my workplace, and no wifi, but streaming is great.
I boosted my Premiere to 4 TB, and I saw somebody here just got a 14 TB working in the Edge.
I don't have sporadic reboots like another poster noted. Maybe has happened 3 times in the past 6 months with it.
One other thing is compatibility with PC software, such as kmttg and pytivo desktop. While I havent seen a way to move videos from my PC to the Tivo, I have no trouble downloading shows on the Tivo to the PC. In fact it's a whole ton faster. On the PRemiere, transferring a 1 hour show would take nearly 1 hour, with the Edge iis less than 10 minutes. Don't recall exactly. It basically is limited to the speed of the 100mbit ethernet.
Being unable to upload videos from PC to Tivo is not very important, because I've got a FireTV stick and the Tivo Stream 4k "stick?" both of which have Kodi loaded on it, and they play videos right from a shared folder on my PC.