Sales experience 5/5 - Mark Newstead did a great job explaining things, was happy to help, and made himself available quickly when required. Installation experience 3/5 - Fitting of the windows and doors seems good. The guys doing the installation were friendly but left an unreasonable amount of debris and rubbish behind. Half hearted attempts at cleaning were made but they were just not good enough. In my opinion some of the mess was just caused due to carelessness on the installers parts where they just willy-nilly discarded plastic pieces and lids of sealant all over the place, which I then had to pick up and that could have easily been collected and discarded. Tip: Equip your installers with cordless vacum cleaners to make their lives easier and cleaning more effective. Product quality 4/5 - Installation of windows and doors was just about a month ago, so hard to tell but quality seems to be good. My only complaint is with the trickle vents. They spewed little bits of plastic, which were clearly from manufacturing where the frames had been cut, for days after installation, which I had to clean up multiple times. Tip: Give your installers brushes to go over the frames before assembling them to get rid of any debris. Aftercare 4/5 - Two of my door handles had chips in them and one of the trickle vents was lose. An engineer with replacement was dispatched a couple of days after with replacement parts. The parts were fine and installation was quick, however the engineer himself seemed like he was in an enormous rush/wanted to get away as quickly as possible. I had to stop him from taking off before I had a change to inspect the work he had done. Not a good experience in terms of customer service. Conclusion - I think KLG are a decent company to use but they need to work on the details of the service they provide and the customer experience. Over all the experience left a bitter taste in my mouth as they seem to market themselves as a premium company but didn't offer the premium experience I expected. Would I use them again? Maybe; but to a great part due to the fact that I know the product quality seems to be good and I wouldn't want to risk getting lower class products elsewhere.