Yes Kommerling is a very good product and have been round for years. I also like the profile of it as it's slightly rounded. Rehau is considered to be the best but Kommerling is not far behind in terms of quality and if fitted right will last for ages. Synseal is also worth a look as that's a copy of the Kommerling profile
You can have a good product fitted badly which will cause problems or you can have a cheap window fitted well which will outlast the other.
Any of the above products will serve you well. Price wise not a big difference when we were looking. Stay away from firms like everest etc. Just make sure you get a firm that fit well and go off recommendations
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