Typically I use LED PID which has been very trustworthy (not a single failure) and k-type reading. When customer specifically asks for LCD (which hasn't happened too often, I look for what is available. I've had too much money tossed down the toilet with that G-Froster (I still have one customer I am trying to get it done right for him... )
I did buy about total 40-50 over time I believe and had to deal with about 20 RMA just on controller part. Whatever left over I sent to Chilly1 while back to help him out since I can't use it on my unit as each controller was costing nearly $500 per controller sold on my end. Considering how many I bought and how many RMAs I had you can do the math on how much I really lost...

Since than, I am very skeptical about these home brewed controllers and stayed away. RunMC recommended this one to me (Freezepack) and I ran some testing and it seems to work fine so far from what I've seen. I also have another controller from forum member here sent for prototype review and feedback from me I am getting ready to check out.
Not quite as refined as freeze pack but seems to have more feature and potential as PCB is home brewed (which was my real complaint about this one but it is protoype after all) and the developer is more keen on listening about need for k-type probe. (it eases up installation so much depending on type of evap... actually on just about all evap).
One thing I would like to see on these controllers are bit different method of clamping down power lines. While those screws do work, it doesn't guarantee 100% safety while in shipment from getting lose. What Mach and vapochill used would be very nice feature to have and also easier to use.
I am getting gibberish now I will stop :P