I am using simultaneously 3 pieces of CSL-USB-DVBT purchased at amazon.de
At the very early project, I used one of them directly at a Raspi1 B, 6 weeks or so. Was okay for recording, never used live TV with Raspi1. Later, I moved the DVB-T stick to an xubuntu 14.04 LTS (x86) nd increased the number of sticks to 3. Works quite good for recording, still not used live TV with (in between 3) Raspi1 B based kodi players.
Again later, I upgraded one player to Pi 2B and frequently I’m using the live TV now (SD resolution).
my 1st setup:
Room Antenna → CSL-DVBT → Raspi1B → HDMI TV
my current setup
Room Antenna under the roof top → Antenna amplifier → loooong cable →
→ Antenna Splitter 1-to-8 → 3x CSL-DVBT → x86 linux with tvheadend + 2TB hdd → 100 Mbit ethernet →
switches → 2x Raspi 1B + 1x Raspi2B → HDMI/SPDIF-Splitter → TVs and SPDIF sound systems
my future setup, planned for autumn:
replace DVB-T with DVB-S or replace DVB-T with DVB-T2.H265 (or a mix of both)
upgrade all Raspi1 to Raspi2
2x 4TB hdd 
chers,