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+.. _differences:
+
+Differences from SleekXMPP
+==========================
+
+**Python 3.4+ only**
+    slixmpp will only work on python 3.4 and above.
+
+**Stanza copies**
+    The same stanza object is given through all the handlers; a handler that
+    edits the stanza object should make its own copy.
+
+**Replies**
+    Because stanzas are not copied anymore,
+    :meth:`Stanza.reply() <.StanzaBase.reply>` calls
+    (for :class:`IQs <.Iq>`, :class:`Messages <.Message>`, etc)
+    now return a new object instead of editing the stanza object
+    in-place.
+
+**Block and threaded arguments**
+    All the functions that had a ``threaded=`` or ``block=`` argument
+    do not have it anymore. Also, :meth:`.Iq.send` **does not block
+    anymore**.
+
+**Coroutine facilities**
+    **See** :ref:`using_asyncio`
+
+    If an event handler is a coroutine, it will be called asynchronously
+    in the event loop instead of inside the event caller.
+
+    A CoroutineCallback class has been added to create coroutine stream
+    handlers, which will be also handled in the event loop.
+
+    The :class:`~.slixmpp.stanza.Iq` object’s :meth:`~.slixmpp.stanza.Iq.send`
+    method now **always** return a :class:`~.asyncio.Future` which result will be set
+    to the IQ reply when it is received, or to ``None`` if the IQ is not of
+    type ``get`` or ``set``.
+
+    Many plugins (WIP) calls which retrieve information also return the same
+    future.
+
+**Architectural differences**
+    slixmpp does not have an event queue anymore, and instead processes
+    handlers directly after receiving the XML stanza.
+
+.. note::
+    If you find something that doesn’t work but should, please report it.