My 1990 Yamaha FZR400 (I sold it years ago..)
A little about the FZR400 if you aren't familiar with it..
The FZR400 was imported to the US for only 3 years (1987 - 1990) with the 1990 model being the most sought after because it included an improved swingarm, brakes, etc. Many of the FZRs went straight from the dealership to the track, and were the entry point for a lot of racers in the US during the early '90s. The Exup model has a small servo motor that opens and closes a valve in the exhaust system to cause a small amount of extra backpressure at lower RPMs to improve torque until the engine reaches the mid rpm range. The exup is a welcome addition for street riding, but on the track the extra hardware was simply deadweight and quickly removed.
Because many of the FZR400s were raced there are a lot of spares available on eBay. There are people racing FZR400s today (it's now considered a "vintage" bike and there are classes it can be raced in) so there are still parts circulating, and an active community of FZR400 racers. There are also a lot of good clean, original parts showing up that were pulled from the bikes when they had almost no miles on them since many of them had their street trim and plastic stripped off and replaced with race trim. So it's very possible to restore one of these bikes with original parts.
The FZR400 has a reputation of being one of the best handling motorcycles ever produced. It's light, and has a rigid frame. The engine is a 400cc inline-four revving to over 14,000 rpm, and will produce somewhere in the neighborhood of 50 - 60hp in "stock" trim. It's more than adequate for street riding. However, remember that this is a 400cc four cylinder. It doesn't have low-end grunt, so it has to be shifted through the gears to keep it motivated. That's good training on the track, but can get tiresome if you have to ride it a lot on the street. The positive aspect of that though is you can scream around running through gears and you'll barely be breaking the speed limit. Try hitting red line on a new R1 and you'll be way past the speed limit. I should also say that this is by no means a slow bike. On tight, twisty curves it's fully capable of keeping up with newer bikes with larger displacement.
If you're interested in using this particular bike as a commuter bike I'd recommend you look elsewhere.. there are plenty of other bikes out there that aren't rare and are better suited for daily riding.