well, this is similar to what has been said:
NEC forced you to purchase additonal hardware:
1. you had to buy a "turbobooster plus" to get stereo A / V jacks and the ability to save games via battery
2. had to purchase "turbo tap" for 2 + player
#1 was more irksome for me, since NES had A/V built in...
on software:
1. pce hucard cases didn't have a "clip" (as tg16 cases did) to hold hucards in place.
2. if you were buying new pce hucards, there wasn't a "back panel" with item description / screenshots
3. in U.S., when TTi cut costs by eliminating hucard cases altogether