To check the glowplugs, make sure the glowplug lamp on the dash behaves properly.
As these engines are direct injection, they don't need glow plugs working to be able to start unless you're looking at operating in extremely cold conditions.
The best way to reduce the risk of glow plugs snapping is to;
a) remove them while the engine is hot - the aluminium head expands more than the steel glow plug
b) check the Beru website and don't apply any more than the quoted breakage torque to the plug. If the plug doesn't move at this torque, find a specialist with a vibrating glow plug removal impact wrench.
The really important factor to guard against glow plugs siezing in the head is to make sure the taper seal between the glow plug and head is in perfect condition. Carbon leaking past this taper seal is THE biggest cause of glow plugs snapping in the head.
Don't use grease when re-assembling the glow plugs as the extra compression force can damage the glow plug - it squeezes closed a gap which provides a thermal short-circuit. The glow plug will continue to work electrically, but, won't actually be producing the heat it should be doing at the glow plug tip.
I wouldn't bother fitting anything other than Beru glow plugs. The technical pages of the Beru web site are particularly helpful.
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Mercedes Benz E-Class W210 - 01 3.2 Chec.. new