J:Com Internet best for central Tokyo?

I actually drafted this query for a different venue, but I'll go ahead and repost a version here in the hopes that it might help someone or someone can add useful information to it. Already got a new lead elsewhere in Japan-Guide...

Here is my summary of the Internet connection options as I currently understand them in November of 2015. This is targeted at central Tokyo (the 23 wards), but most of it may generalize to the primary J:Com areas. My current bias is for the minimal J:Com connection, but your mileage may differ and the situation is constantly changing. Mostly I use lots of data, but not lots of speed, and the research has been precipitated by moving back into Tokyo proper.

My hope had been to stay with WiMAX, which has served all of my communication needs quite well for a couple of years. With a separate minimal phone contract the total bill was less than 5,000 yen/month (and the free smartphone was not minimal). However, that is no longer viable because, quite surprisingly, the WiMAX signal quality in central Tokyo is too low. Yeah, I'd been warned about signal problems with WiMAX, but this is the first time the signal problems have become major, and based on several discussions with WiMAX, they apparently think it is しょうがない and I think it is "Bye bye."

The best option appears to be a basic J:Com Internet package, which includes a WiFi hub for about 3,500 yen/month. I hope this will handle all of my needs and I will focus on learning about and using remote WiFi options (in stations and stores). The J:Com WiFi router may be limited to only 4 connections at a time, which seems quite low to me... There's a phone option, too, but I doubt it's worth it.

There are two J:Com options with TV channels. One seems to be about the same television channels as the broadcasts you can get for free. The other one is much more expensive, but offers many more channels. However, the only channel that I might be interested in is HBO, and that is not included with any J:Com option. Maybe you know ways?

Or perhaps it would be possible to share a neighbor's connection? There are several visible and strong WiFi signals that might be coming from any of my neighbors, or their hub may be invisible for higher security. Perhaps the contracts specify no sharing? Also, I don't like bothering neighbors...

The widely available Flets option actually seems to have a bunch of flavors. At the base, NTT almost always controls the fiber, but it seems that it is possible to essentially sublease the fiber to other companies such as So-net. Though some of these secondary contract arrangements appear to be slightly less expensive, I doubt the savings are worth the extra hassle, especially since NTT will remain in the middle anyway. (Perhaps some of these deals are sweetened with phone options?) Personally, I've had more than enough of NTT and would be willing to play slightly more to avoid that company, while the J:Com option actually appears to be slightly less expensive...

That's sort of the dump of what (I think) I know now, but it gave me several ideas about additional directions for research...

As I understand the situation with Flets is that they manage the hardware only (the fiber line and also the modem/router unit), and then you can choose the provider of your choice (So-net being one option) to provide the actual Internet access through its own Internet infrastructure. The situation is similar to virtual mobile carriers which use the hardware of one of the big carriers and then use their own infrastructure to provide the actual internet access.

Personally, I am with Flets + So-net, and although I didn't really have a choice (I am in university housing and this was the only option offered through the building's management), it works very well and I am completely satisfied with it. (Caveats: I am not in Tokyo and I do not use TV or phone.)

One thing that may be of interest is if you have an AU phone contract you can get a discount on j.com because they have a partnership (I think it ends up being something like 1500-2000 yen off a month.)

I've been happy with my j.com service (especially since the discount) but that's the service that my building already had set up so I didn't shop around. I've found the customer service to be good the few times I've had problems.