Low odour systems do tend not to be colour stable and over time can look quite revolting .. I've see some turn brown before now.
Low odour systems are also .. After gels .. The most likely to cause allergic reactions because they are sticky and that 'roll off' layer is unreacted and so is the dust and it is nearly impossible not to come into contact with that dust when filing. Be very careful using a low odour system.
So much easier to learn to minimize the odour of normal monomer so that you hardly know you are using it. Good working practices, proper disposal and not wiping your brush on paper towel will immediately reduce odour in your working area to almost nil.
You can Minimize odour to practically zero without spending a penny! Just by working smart.
The main thing that causes odour is wiping your monomer out of your brush onto a dry paper towel .... This is the worst thing you can do.
Dampen a gauze pad with Scrub Fresh or your nail sanitizer and dedicate that pad as your brush wiping area and you will loose 70% of the vapour in the air at a stroke!
Use metal bins for all waste and empty twice a day.
Always keep you monomer in a glass dappen dish and covered when not using it.
Of course as well to help, you can also choose to use a low odour monomer like CND Retention+