Mark,
I buy the Selection Limited edition reds from BK every year, which are 16 litre kits to make 23 litres (5 gals imp or 6 gals US) these kits in UK used to be about £50 each but the price has now risen to £57 each. Last year I bought my first Selection Estate series red -- a Lodi Zinfandel Old Vines red kit at £75 but I only started it in September and it is still sitting undisturbed, bulk aging so I can't comment. In UK there is no other kit as yet available that is of the same quality (or price range). I make much less wine than I used to and make more kit wines -- space in my small flat ( apartment) being the limiting factor. I have been making the Selection series reds for a fair few years now since they first became available in UK.
To be honest I have become increasingly critical of kit reds as time has gone on. I am a type 2 diabetic ( dietary control only) and my consumption of wine has been savagely curtailed and perhaps that is why I am more appreciative of the wine when I have my permitted occasional bottle.
My white wine kits ( at about 1/2 the cost of the Selection red kits) produce far superior wines which are recognisable as from within their varietal grape type. In particular my Muscadet and Sauvignon Blanc are very typical!
The reds -- well as I said, I only have one bottle per week but I am increasingly dissatisfied with the end results of a year bulk aging before bottling. My criticism is, as ever, that "cooked " taste and, increasingly, a lack of character, bland, and lack of tannin. The wines are full of fruit flavour but just not up the comparison with an inexpensive red bought from a good supermarket wine section. I have just sampled my first bottle of limited edition Syrah/Mouvedre made in Spring last year. The blurb on BK's back label states --"..... this elegant red wine is rich and complex, showing strong tannins and earthy character ....." Well no it isn't! Fruity but totally lacking in "strong tannins" and where is that "earthy character". It was like drinking a tepid fruit soup that needed the addition of chilli gin to bring out its flavours. I certainly would not inflict it on any guest of mine. I have checked my records and find that I may not have added extra tannin at the initial fermentation stage. I started doing that with my Selection kits a couple of years ago to try and improve the mouth of my wines and I perceive some benefit -- but it does tend to be a hit and miss affair. My criticism of kit reds is not confined to BK Selection , it is just the Selection kits are ( IMHO) the best available in UK. I think my best result is BK Selection Rioja. One I did about 4 years ago is finished now but after the second year in bottle was probably the best I have tasted but still lacked that "finish"
Sorry this has been so long a response. Perhaps, when a method of colour extraction of red grapes is "invented" that does not involve "boiling" the fruit, the reds will improve.
I just wish I could get red wine grapes and/or fresh red grape juice in UK!
Hope it helps.