3rd party QSFP-100G-LR4-S for Cisco

Hey all, Does anyone have a recommended model of 3rd party's "QSFP-100G-LR4-S" for Cisco ASR and Nexus? Cisco's original 100G SFP costs us an arm and a leg, so we want to try to use 3rd party 100g SFP. But we are not sure which manufacturer's SFP is reliable or has good performance. Does anyone have experience? Many thanks, Roy