advice on unvented cylinders

[impo]

hello all
i am in the process of buying an unvented to replace my thermal store(boiler mate 2) i know that the very best would be a mega flow however i am on a budget i need a 170l indirect unvented (3 beds 1 bath 2 adults 1 child)
there are many cheeper versions, ariston,santon etc and 1 by evolution.
any advice on which of the cheeper ones are good/bad etc.
i am a sparky so only have limited knowledge. thanks.....

 

[stevetheplumber]

never had any trouble with aristons

 

[plumbnuts]

Some of the cheaper ones are glass lined opposed to stainless steel and normally only offer a 10 year guarantee. With the SS you would normally expect a 25 year guarantee.
Steve