As long as bank issued notes are not legal tender, I have no problem with fractional reserve banking in the legal sense. I still don't think it's good.
Fractional reserve banking manipulates the value of the bank notes it deals in, affecting everyone who holds those bank notes. The fact that you carry a bank note means that they have their hands in your pocket. In the long term, I don't see how this can benefit anyone except the banks which collects interest on a promise it could never fulfill.
The bank relies on perpetual and ever growing debt, of which it is the sole beneficiary. Yes, it can stimulate economic growth. But debt rises faster than the economy does and the only way to perpetuate that growth is by debasing the currency and ramping up inflation to create a demand for more debt. Such a system makes us slaves to the bank.
If we did not have fractional reserve banking, we wouldn't have an economy as well developed, but it also would not have the unsurmountable debt we have. Lending would be at high interest rates due to real risk, borrowing would be greatly discouraged. Trade would move slower, but it would not be subject to booms and busts as greatly as it is today.
Without fractional reserve banking, growth would be sustainable.