I am designing a WLAN for office environment and I was wondering is it a recommended practice to you use different models depending on the requirements? For example, there are few conference rooms and the user density is not always high. Most of the users are capable of using the 5Ghz channels. So I want to place AP250s in that area to use the software radios and AP230s in other areas where they might be some users on 2.4GHz channels. Does this design cause any performance issues ?