Hi FrostyCanada - PV1 explained it well. Cars with very strong regen include the Tesla and BMW i3 (although it's my understanding that BMW backed off a bit from the very high regen that they first started with). Even though the Tesla max regen is only about 30% of max power, it has so much power available that even that amount of regen really slows it down despite the car's tremendous weight.
There is a worldwide UN performance standard in terms of deceleration above which the brake lights must turn on. The i-MiEV is still below that range.
On the i-MiEV, I tell people that when driving I have four levels of regen: zero (when placed into Neutral), and one for each of the drive settings. The 125A number is the max regen current in B I recall seeing on CaniOn (may have been 130A?), with 155A being the maximum measured current drawn when accelerating hard.
Back on topic, I fear that the single rear wheel drive of, for example, the SOLO, will preclude aggressive regeneration because of the concern over rear-wheel lockup on slippery surfaces. This point could be software controlled using the ABS sensors, but I don't know if they're taking the time to develop this yet.
EVs: 2 Wht/Blu SE Prem., '13 Tesla S85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV