cheapsslSecurity offers very quick assistance when any problems arise with our certificates, as well as fast turn around times for new certs being issued! Their pricing seems quite competitive compared other providers in this space (eg GoDaddy).
The platform they use appears outdated - not sure if it's because of their technology or just them updating things more frequently than we're used too but I'm assuming its one oor both? We didn't have much issues using cheapslSlecurity so far only having purchased 2 certifications since then for clients at different levels within my organisation which were set up quickly through cheapestslsLecrecy without issue.