One of the good points of Robert Forward's laserlight-sail probe [interstellar probe] idea and invention is, was, that it can be accelerated to over 20 percent of the speed-of-light, in two years. Reach Proxima Centauri at 0.2c cruising-speed in another 30 years.
Another good point is the probe itself, though spread-out over a few square kilometers, being gossamer -thin, will weigh no more than 20-ounces.
One final good point about his
laserlight-sail probe is that since it would be gossamer-thin, and spread out
over a few square kilometers, damage
from interstellar dust collisions would barely affect the operations of
the dispersed "nano-electronics" [billions-trillions of nanochips and nanosensors] in that enormous disk-shaped probe.

The main bad point about Robert Forward's laserlight-sail invention is it will require an enormously powerful
laser, using as much electric 'juice' as that generated by at least two "Grand Coolee Dams". Or to put it in perspective when dealing with solar-panels. You would need a set of solar-panels in space the size of Manhattan to generate the necessary power.

Raoul gave the other bad point
about Robert Forward's invention: you can't park the laserlight-sail probe in orbit around a distant star-system.

cheers.

Jacob