diff --git a/rasterio/_base.pyx b/rasterio/_base.pyx
index a5ef3697..04f454d0 100644
--- a/rasterio/_base.pyx
+++ b/rasterio/_base.pyx
@@ -448,6 +448,10 @@ cdef class DatasetReader(object):
         else:
             return None
 
+    @property
+    def is_tiled(self):
+        return self.block_shapes[0][1] != self.width
+
     property profile:
         """Basic metadata and creation options of this dataset.
 
@@ -457,10 +461,13 @@ cdef class DatasetReader(object):
         def __get__(self):
             m = self.meta
             m.update(self.tags(ns='rio_creation_kwds'))
-            m.update(
-                blockxsize=self.block_shapes[0][1],
-                blockysize=self.block_shapes[0][0],
-                tiled=self.block_shapes[0][1] != self.width)
+            if self.is_tiled:
+                m.update(
+                    blockxsize=self.block_shapes[0][1],
+                    blockysize=self.block_shapes[0][0],
+                    tiled=True)
+            else:
+                m.update(tiled=False)
             if self.compression:
                 m['compress'] = self.compression.name
             if self.interleaving:
diff --git a/rasterio/rio/merge.py b/rasterio/rio/merge.py
index d816ac74..5e637c87 100644
--- a/rasterio/rio/merge.py
+++ b/rasterio/rio/merge.py
@@ -73,6 +73,7 @@ def merge(ctx, files, output, driver, bounds, res, nodata, force_overwrite,
     profile['height'] = dest.shape[1]
     profile['width'] = dest.shape[2]
     profile['driver'] = driver
+
     profile.update(**creation_options)
 
     with rasterio.open(output, 'w', **profile) as dst:
diff --git a/rasterio/rio/options.py b/rasterio/rio/options.py
index 0e5aeb82..dfccd54f 100644
--- a/rasterio/rio/options.py
+++ b/rasterio/rio/options.py
@@ -73,6 +73,8 @@ def _cb_key_val(ctx, param, value):
                 raise click.BadParameter("Invalid syntax for KEY=VAL arg: {}".format(pair))
             else:
                 k, v = pair.split('=', 1)
+                k = k.lower()
+                v = v.lower()
                 out[k] = v
 
         return out
diff --git a/tests/data/shade.tif b/tests/data/shade.tif
index 6a5a2262..9ea0f3f0 100644
Binary files a/tests/data/shade.tif and b/tests/data/shade.tif differ
diff --git a/tests/test_options.py b/tests/test_options.py
index 38ee698b..03bb15d2 100644
--- a/tests/test_options.py
+++ b/tests/test_options.py
@@ -7,7 +7,7 @@ def test_cb_key_val():
 
     pairs = ['KEY=val', '1==']
     expected = {
-        'KEY': 'val',
+        'key': 'val',
         '1': '=',
     }
     assert options._cb_key_val(None, None, pairs) == expected
diff --git a/tests/test_profile.py b/tests/test_profile.py
index 32979c4d..07cc2cf3 100644
--- a/tests/test_profile.py
+++ b/tests/test_profile.py
@@ -79,11 +79,26 @@ def test_profile_overlay():
     assert kwds['count'] == 3
 
 
-def test_dataset_profile_property(data):
+def test_dataset_profile_property_tiled(data):
+    """An tiled dataset's profile has block sizes"""
+    with rasterio.open('tests/data/shade.tif') as src:
+        assert src.profile['blockxsize'] == 256
+        assert src.profile['blockysize'] == 256
+        assert src.profile['tiled'] == True
+
+
+def test_dataset_profile_property_untiled(data):
+    """An untiled dataset's profile has no block sizes"""
+    with rasterio.open('tests/data/RGB.byte.tif') as src:
+        assert 'blockxsize' not in src.profile
+        assert 'blockysize' not in src.profile
+        assert src.profile['tiled'] == False
+
+
+def test_dataset_profile_creation_kwds(data):
+    """Updated creation keyword tags appear in profile"""
     tiffile = str(data.join('RGB.byte.tif'))
     with rasterio.open(tiffile, 'r+') as src:
         src.update_tags(ns='rio_creation_kwds', foo='bar')
-        assert src.profile['blockxsize'] == 791
-        assert src.profile['blockysize'] == 3
         assert src.profile['tiled'] == False
         assert src.profile['foo'] == 'bar'