The biggest drawback (IMHO) is that wireless is still a shared media.
You can use workgroup bridges to connect clusters of PCs / printers / etc., or put in wireless NICs in each unit ... the bottom line is still "how much of what kind of traffic " (traffic characteristics).
Wireless will work OK, if you design properly. If you just start dropping APs everywhere, life as an admin is likely to get ugly.
Plan as if you were using 10Meg Hubs. Where you have groups of PCs together, use a WGB. If the area design allows for it, you may want to implement some VLANs.
There is no generic answer except "It depends." It depends on your traffic loads, your budget, your expertise (or available expertise), the layout of the building, the PCs & printers you intend to connect .... the list goes on and on.
Try a design as if the APs were 10meg hubs, then do a site survey to see what coverage will be like for the local areas. Then change your design and survey again ... repeat as necessary.
It might be worthwhile to do a pilot in a non-critical area ... then you can baseline and monitor the setup to get a "real life" version of whether or not the wireless system will work for you ... or at least what adaptations may need to be made.
FWIW
Scott
