if you just want the popular stuff they will be fine since they keep that since many download it but if you veer off that path they have poor completion since their system does not keep everything. but even then with other services at similar prices you can get better for the same price.

blocks could be a bit restrictive unless you reliably download the same each month so you have predictable usage. if you ever deviate or find yourself having to hold back so you dont burn up your block, an unlimited account may be better and then you dont have to worry. unlimited is cheap enough now.

newsdemon is sadly just not that good with their selective retention when better alternatives are there at a similar price.

i think most others covered it but for provider Frugal usenet is probably best bang for your buck as you get access to two separate systems.