I'm using the µIEC. I like it and have been using it mostly to load one-file programs like tools and games for Vic20 and +4. It isn't working well enough for modern games and demos for C64 and 128. I also have a 1541 Ultimate II but I rarely use it since the memory card swapping is too cumbersome. I mostly transfer to real disks instead and recycle the contents on a handful of disks.
The new game Slipstream supports Chameleon's d030 mode so it makes use of the C128 2MHz mode in the border. Much needed, but I haven't tried it myself yet. It would be interesting to see if it works on the SuperCPU.
I typed in a lot of games from magazines when I was a kid. I remember Your Computer having a series of type-in parts for a pac-man clone and a space game by Nalin Sharma. I can't remember the names right now. It was a lot of work to type in, but I did anything to play a game back then.
I actually have the book so I can look at trying to call everything except the thing that auto boots, but I think that it may be harder than it seems since I can't call anything that continues though that routine.