LTE User Equipment (UE) Categories: Which one is meant for you?

Many companies are launching their 4G-enabled phones from this year. Recently launched Xiaomi's MI Note 4G is available in India for Rs 8999.
Different 4G phones come with different speeds. LTE UE category of the device decides max downlink/uplink speed that it supports.
In this post, I am going to summarise various LTE UE categories from 3GPP and devices which support particular category.

Category	Max Downlink Speed (Mbps)	Max Uplink Speed (Mbps)	3GPP Release	No. of Supported MIMO	Supported Devices
Cat 1	10	5	Rel. 8 (LTE)	1	N/A
Cat 2	50	25	Rel. 8 (LTE)	2	N/A
Cat 3	100	50	Rel. 8 (LTE)	2	Original Moto X, iPhone 5
Cat 4	150	50	Rel. 8 (LTE)	2	Nexus 5, Moto G 4G, Moto X (2nd Generation), iPhone 6, MI Note 4G, Samsung Galaxy S5, LG G3
Cat 5	300	75	Rel. 8 (LTE)	2	N/A
Cat 6	300	50	Rel. 10 (LTE-Advanced)	2 or 4	Huawei Honor 6, Samsung Galaxy S6 LTE-A, LG G3 LTE-A, Nexus 6
Cat 7	300	150	Rel. 10 (LTE-Advanced)	2 or 4	N/A
Cat 8	1200	600	Rel. 10 (LTE-Advanced)	8	N/A
Cat 9	450	50	Rel. 11 (LTE-Advanced)	2 or 4	N/A
Cat 10	450	100	Rel. 11 (LTE-Advanced)	2 or 4	N/A

Among these, Cat 3, Cat 4 and Cat 6 devices are more common. Cat 9 devices will arrive in 2016.
Cat 3 devices are slowly becoming outdated and most of the phones coming next year will support Cat 4 LTE. Cat 6 and above UE categories are also mentioned as LTE-Advanced. Carrier aggregation is the special characteristic of LTE-Advanced. It allows to aggregate two distinct parts spectrum for better network throughput and hence higher speeds.
Cat 4 LTE will be in many budget 4G phones coming next year. Many cheaper Snapdragon SOCs including 210, 400, 410, 610, 615 and 800 support Cat 4 LTE. Cat 6 LTE is supported by high-end Snapdragon SOCs like 805 and 808. It is mostly meant for high end flagship phones. Snapdragon 810 SOC includes support for Cat 9 LTE. But no device currently supports it. Alright, that's enough information to check how much LTE potential your device has.