I'm posting this data that a very trustworthy friend gave me:
"To begin it is not yet correct to say that the Bc is better than the Bd
except for future potencial use
It seems that MA made a balance on what available implants could do and their rarity
The Ae was definatly the rarest of the A series and got to level 30
I could not get a Ae for a "decent" price (since it could not use level I, I was unwilling to pay their markup by an order of 100 PED, it would force me to use minor tp instead of lesser afterwards so I figure that the decay had to be extremelly better which was very unlikelly due to previous hearsay)
And to my knowledge it was very hard to get a Bc, they were for sure more rare than the Bd
I bought a Bc with the only purpose to test its decay, since for its use it would be the same (because I didn't use Level VIII chips back then)
So
The Bd had higher decay than the Bc, "not as good" is a matter of opinion, I preferred the Bc and seemingly hit the lottery as I had one in storage (now on auction).
this is false in my opinion the Bd had the lowest decay of all that I've tested in the past
I already tested the NeoPsion 50 Mindforce Implant today
and I can say that until further tests I will be using the TT implant
(I have the NeoPsion 40 Mindforce Implant available to test but haven't since the 6 PED cost is unreasonable for a "potential" difference of at the most 0,2 PEC per use, so I postpone it until I decide that I will use Mindforce on a frequency that justifies it, or until my curiosity gain momentum, which will probably happen next week)
NeoPsion 10 Mindforce Implant decay: 0.457 PEC
NeoPsion 50 Mindforce Implant decay: 0.617 PEC
NeoPsion 50 Mindforce Implant decay is lower than the former Bc decay but the NeoPsion 10 Mindforce Implant is much lower than than the Aa
So MA I praise MA for making Mindforce implementation more cost friendly
Currently no chip that I saw needs more than a level 20
(probably next week with new (L) we may get something which requires above level 20)
Synchronization Chip XIV
Required level: 1.0
First Gen Firestorm Chip VIII
Required level: 4.0
First Gen Electric attack Chip VIII
Required level: 11.0
First Gen Resurrect Chip VIII
Required level: 14.0
Regeneration Chip VIII
Required level: 14.4
First Gen Wormhole Chip VIII
Required level: 15.7
So highest required is 15.7
Teleportation Chip VIII can't be checked in auction
Teleportation Chip VII
Recomended level: 25.0
Is Recomended level also a Required level ?
So saying that the Bd got nerfed without knowing its decayed is at best an uneducated gamble, knowing MA ability to come with new things I would say that as long as the decay on the NeoPsion 40 Mindforce Implant isn't higher than 0,8 PEC then it wasn't really nerfed,
it were the others that were boasted up.
"