I agree with Jordan, the Contess is extremely reliable and very easy to use. We use it in all our applications with great ease, generating accurate cell counts and viability measurements within 30 seconds. Please see the following link for more information
We've been using the LUNAII (https://logosbio.com/luna-ll/) by logos biosystems for a solid while now, haven't run into a single hiccup. The reusable slides option is also a big plus for us.